NAME __________________________________________
PERIOD _______
Score
Points
Homework Packet
Principles of Heredity
2
Chromosome Mapping
2
Probability and Activities
(#1-11)
2
Simple Genetics Problem (#12-15)
2
Practice Crosses (#16-24)
2
Dihybrid: You Try Problems (#25-27)
2
Test Crosses (#28-31)
2
Incomplete Dominance (#32-38)
2
Co-Dominance & Blood Types (#39-43)
2
Multiple Alleles (#44-46)
2
X-Linked Genes (#47-56)
2
Human Pedigree (#57-72)
2
Test Review
6
Visual Vocab Cards
5
Reflections
20
Quiz-Reflections
5
TOTAL
60
Interactive Notebook
A multi-cellular organism
develops from a single
zygote, and its phenotype
depends on this genotype,
which is established at
fertilization.
Unit Assessments
Points
Exam-Genetics
100
Lab-Baby Reebops
25
Project: Genetic Disorders Planner
35
Project- Genetic Disorders Presentation
15
Due Date
Name ________________________
Period____________
PRINCIPLES OF HEREDITY
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1. Gregor __________________, the "father of genetics"
2. The first ________________generation is the offspring of a cross between parents that are pure for a given trait.
3. The principle of ______________ states that one allele is dominant and one is recessive
4. The outward expression or appearance: ____________________________
5. Cross that involves parents that differ in TWO traits. _________________________
6. The study of heredity: _____________________________
7.
An alternate form of a gene: _______________________
8. The Law of______________ Assortment, states that genes separate from their homologous pairs during meiosis.
9. Having non identical alleles (not pure): __________________________
10. Having identical alleles (pure): _______________________________
11. Square used to determine probability and results of cross: _______________________
12. The allele that is masked by the dominant allele: ______________________________
13. The genetic make-up or an organism: _______________________________
14. A cross that involves ONE pair of contrasting traits: ___________________________
15. The plants Mendel did his studies on: ________________
16. The likelihood that an event will happen: ___________________________________
17. When both alleles are dominant ________________
18. Principle of __________________________ states that alleles separate when gametes are formed.
Chromosome Mapping: Should this dog be called Spot?
Imagine this is a microscopic drawing. A sperm cell from a male dog fuses with an egg cell from a
female dog. Each dog’s gametes carry 39 chromosomes. The zygote that results from fertilization
contains 78 chromosomes; 39 from each parent. One pair of the haploid chromosomes is shown
below.
Chromosome from a Female Dog
Chromosome from a Male Dog
Each chromosome of the homologous pair contains alleles for the same trait. One chromosome
may have a dominant allele and the other a recessive allele. Use the drawing and table to answer
the following questions.
TRAIT
Hair Length
Hair Texture
Hair Curliness
Coat Pattern
DOMINANT GENE
Short (L)
Wiry (T)
Curly (H)
Spotted (A)
RECESSIVE GENE
Long (l)
Silky (t)
Straight (h)
Solid (a)
1. Remind me!!! Why does Meiosis occur?
2. Draw what the chromosome will look like after fertilization.
3. Will the new puppy have a spotted coat?
4. Will the new puppy have short or long hair?
5. Will the hair be curly or straight?
6. Will the hair be wiry or silky?
7. How do you know the answers to the above questions?
8. What is really happening within the organism that leads to the traits (think gene expression)
9. Imagine that a crossing over has occurred between the parental chromosomes (chromatids),
draw what the new the new gene combinations. Assume that the genes for hair length and
texture were involved.
PROBABILITY
PROBABILITY WORKSHEET: show your math for all calculations!
Activity 1: Deck of Cards
Trial
1
2
3
4
5
a.
b.
c.
d.
e.
Card pulled out
How many cards are in your deck?
How many Queen of Hearts are in your deck?
What is the probability of pulling out the Queen of Hearts?
How many cards have hearts as the suit?
In which case do you have a greater probability: Pulling out a Queen of Hearts of pulling out a
card with the heart on it?
Activity 2: One Penny Toss
Toss #
Heads
Tails
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a. How many different possibilities can a penny toss have?
b. From one toss, the penny either lands on ____________ or ____________.
c. What is the probability that the penny will land on tails?
Activity 3: One Die Roll
Roll #
1
2
3
4
5
6
Number Obtained
a. How many different outcomes can you have from one roll of the die?
b. How many times do “3 dots” appear on one die?
c. What is the probability that you roll a 3 with one die?
1
PRACTICE PROBLEMS
Directions: State the rule that you used and show all math work for Rules 1 and 2.
1. If you toss a penny into the air, what is the probability that it will land heads up? Rule Used:
2. What is the probability rolling a 6 with one die? Rule Used:
3. What is the probability of pulling the ace of hearts out of a deck of 52 cards? Rule Used:
4. What is the probability of pulling any ace from a deck of 52 cards? Rule Used:
5. A bag of beans contains 100 white beans and 100 red beans. What is the probability of reaching into the
bag and pulling out a white bean? Rule Used:
6. What is the probability of tossing two pennies and having them both land heads up? Rule Used:
7. What is the probability of rolling a pair of dice and getting snake-eyes (double 1’s)? Rule Used:
8. What is the probability of rolling a pair of dice and getting any doubles at all? Rule Used:
9. What is the probability that a woman’s first child will be a baby girl? Rule Used:
10. What is the probability that the second child will be a baby girl? Rule Used:
11. Summarize how probability can be used in the study of Genetics.
___________________________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
2
SIMPLE GENETICS PRACTICE PROBLEMS
12) For each genotype below, Label as heterozygous (He) or homozygous dominant (HD) or homozygous recessive (HR)
AA _____
Ee ____
Ii _____
Mm _____
Bb _____
ff ____
Jj _____
nn _____
Cc _____
Gg ____
kk _____
oo _____
DD _____
HH ____
LL _____
Pp _____
13) For each of the genotypes below determine what phenotypes would be possible.
Purple flowers are dominant to white flowers.
Bobtails in cats are recessive to normal length tails
PP __________________
TT _________________
Pp __________________
Tt _________________
pp __________________
tt _________________
14) For each phenotype below, list the genotypes (remember to use the letter of the dominant trait)
Straight hair is dominant to curly.
Pointed heads are dominant to round heads.
____ straight
_____ pointed
____ straight
_____ pointed
____ curly
_____ round
Right handedness is dominate to left
handedness
_____ right
_____ right
_____ left
15) Set up the Punnet squares for each of the crosses listed below. Round seeds are dominant to wrinkled seeds
RR x rr
How many of the offspring will be:
Round?
Wrinkled?
RR x Rr
How many of the offspring will be:
Round?
Wrinkled?
Rr x Rr
How many of the offspring will be:
Round?
Wrinkled?
Rr x rr
How many of the offspring will be:
Round?
Wrinkled?
3
PRACTICE WITH CROSSES. USE THE 6 STEP METHOD YOU HAVE BEEN TAUGHT, TO COMPLETE
THE CROSSES LISTED BELOW. YOU WILL THEN USE THE ANSWERS, TO FILL IN THE BALNKS
BELKOW. SHOW ALL 6 STEPS OR NO CREDIT!!!!
16) A TT (tall) plant is crossed with a tt (short plant).
a) What percentage of the offspring will be tall? ___________
17) A Tt plant is crossed with a Tt plant.
a) What percentage of the offspring will be short? ______
In Pea seeds round seeds are dominat to wrinkled seeds
18) A heterozygous round seeded plant (Rr) is crossed with a homozygous round seeded plant (RR).
a) What percentage of the offspring will be homozygous (RR)? __________
19) A homozygous round seeded plant is crossed with a homozygous wrinkled seeded plant.
a) What are the genotypes of the parents? __________ x __________
b) What percentage of the offspring will also be homozygous? ___________
In pea plants purple flowers are dominant to white flowers.
20) If two white flowered plants are cross, what percentage of their offspring will be white flowered?
______________
21) A white flowered plant is crossed with a plant that is heterozygous for the trait. What percentage of the
offspring will have purple flowers?___________
In guinea pigs, the allele for short hair is dominant.
22) What genotype would a heterozygous short haired guinea pig have? _______
a) What genotype would a pure breeding short haired guinea pig have? _______
b) What genotype would a long haired guinea pig have? ________
23) Show the cross for a pure breeding short haired guinea pig and a long haired guinea pig.
a) What percentage of the offspring will have short hair? __________
24) Two short haired guinea pigs are mated several times. Out of 100 offspring, 25 of them have long hair.
a) What are the probable genotypes of the parents? ________ x ___________
4
Dihybrid Cross
Two factor crosses involve 2 traits, like pod color & pod shape in pea plants. The inheritance of one trait does not
affect the inheritance of the other trait. This type of cross demonstrates Mendel’s Law of Independent Assortment.
SAMPLE #1: PEA PLANTS
R = round seeds
G = green pods
r = wrinkled seeds
g = yellow pods
What’s the genotype of a plant heterozygous for both round seeds and green pods?_____________
What’s the genotype of a plant that has wrinkled seeds and homozygous green pods?____________
What’s the genotype of a plant that has wrinkled seeds and yellow pods?__________________
Now let’s cross 2 plants that are heterozygous for the 2 traits (seed shape & pod color).
1) Identity Dominant and Recessive _ (done for you above) ___________
2) Parent phenotypes  _____________________
x _________________________
3) Parent genotypes
 _____________________x
_________________________
4) Sperm or Eggs (FOIL)
5) Punnett square
6) Possible Phenotypes
7) Phenotypic ratio ________________
SAMPLE PROBLEM #2: MARTIANS
In Martians, yellow eyes (Y) are dominant over pink eyes (y). Webbed feet (F) are dominant over hoofed feet (f). What’s
the genotype of a Martian that is heterozygous for both traits? _______________
What’s the genotype of a Martian that has heterozygous yellow eyes and hoofed feet? ____________
Now show the five steps of a cross between a homozygous yellow-eyed, heterozygous webbed-footed Martian
with a pink-eyed, hoofed-footed Martian.
1) Identity Dominant and Recessive ________________________
2) Parent phenotypes  _____________________
x _________________________
3) Parent genotypes
 _____________________x
_________________________
4) Sperm or Eggs (FOIL)
5) Punnett square
6) Possible Phenotypes
7) Phenotypic ratio ________________
5
Practice
25) FOIL … this Genotype TtRr
26) In humans, the gene for brown eyes (b) is dominant to the gene for blue eyes and the gene for right handedness (r) is
dominant to the gene for left handedness. Cross two individuals heterozygous for both of these characteristics.
a) Dihybrid Probability can be solved by multiplying the separate probabilities for each trait. Use math to solve for the
probability instead of the Dihybrid cross.
27) In mice, the ability to run normally is a dominant trait. Mice with this trait are called running mice (R). The recessive
trait (r) causes mice to run in circles only. Mice with this trait are called waltzing mice. Hair color is also inherited in
mice. Black hair (B) is dominant over brown hair (b). Cross a heterozygous running, heterozygous black mouse with a
homozygous running, brown mouse.
a) Dihybrid Probability can be solved by multiplying the separate probabilities for each trait. Use math to solve for the
probability instead of the Dihybrid cross .
TEST CROSSES
A test cross is used to determine the genotype of a dominant trait. (A dominant trait can be either homozygous dominant
or heterozygous.) The unknown trait is crossed with the recessive trait. If any offspring show the recessive trait, the
dominant parent had to be heterozygous.
28) A black guinea pig crossed with an albino. There are 5 black and 4 albino offspring. What is the genotype of the black
parent?
29) In another cross of a black guinea pig with an albino, there were 10 black offspring. What is the genotype of the black
parent?
30) Two normally pigmented parents have 10 children, two of which are albino. What are the parental genotypes?
(Albinism is recessive)
31) Juan has six fingers on each hand and six toes on each foot. His wife, Alicia, and their daughter, Maria, have the
normal number of digits. Extra digits is a dominant trait.
a). What fraction of their children would be expected to have extra digits?
b). What is Juan’s genotype
6
Incomplete Dominance
32) Practice setting up keys for the phenotypes listed in each set. Remember that the "medium" trait must always be
heterozygous
a)
Birds can be blue, white, or white with blue-tipped feathers. (Blue is dominant)
b)
Flowers can be white, pink, or red. (Red is dominant)
c)
A Hoo can have curly hair, spiked hair, or a mix of both curly and spiked (Curly is dominant)
33) In Smileys, eye shape can be starred, circular, or a circle with a star. Write the genotypes for the pictured phenotypes
(Star eyes are dominant, circles are recessive)
34) Show the cross between a star-eyed and a circle eyed.
a) What are the phenotypes of the offspring? ____________
b) What are the genotypes? __________
35) Show the cross between a circle-star eyed, and a circle eyed.
a)
How many of the offspring are circle-eyed? ____________
b) How many of the offspring are circle-star eyed? ____________
36) In humans, curly hair is dominant over straight hair.
a) Cross a woman heterozygous for hair curl with a man with straight hair.
b) What is the phenotype ratio the offspring?
37) In four o'clock flowers red is dominant to white , Cross a red plant and a white plant
38) Cross any 2 of their offspring
a) What is the phenotype ratio? ________________
Multiple Alleles: Smiley’s Genetics
In smiley’s, the shape of the eye is controlled by MULTIPLE ALLELES, much like blood types.
The smileys pictured show the four possible phenotypes. It is known that the star and dot eyes are codominant and the square
eyes are a recessive trait.
Assign genotypes to each of the smiley’s pictured.
________
_________
_________
_________
39) If a star-eyed smiley (homozygous) is crossed with a dot-eyed smiley (also
homozygous) what will all of their offspring look like?
40) If the pair in the cross about were both heterozygous, what will their offspring
look like and in what proportion?
41) If a starry-dot eyed smiley is crossed with a square eyed smiley, what type of
eyes can their children have and in what proportion.
7
CO-DOMINANCE AND BLOOD TYPES
Blood Type is controlled by 3 alleles: A, B, O. A & B are codominant, O is recessive.
The Letter I represents the blood cell, and the allele is a superscript
A
I = A protein
Dominant
IB = B protein
R = has Rh protein
Recessive
i = no protein
r= no Rh protein
42)
a) What are the two genotypes possible for a person who as A blood? ______________
b) What genotype does a person with AB blood have? _______________
c) What genotype does a person with O blood have? ____________
d) What are the two genotypes possible for a person who as B blood? ______________
43) A man with type AB blood is married to a woman also with type AB blood.
a) What blood types will their children have
b) In what proportion?
44) A man with type AB blood is married to a woman with type O blood. They have two natural children and one adopted
child. Jane has type A blood, Bobby has type B blood, and Grace has type O blood.
a) Which child was adopted? ____________________
45) A woman with type A blood (genotype AO) is married to a type B person (genotype BO). What proportion of their
children will have:
a) A blood? _______
b) B blood? _______
c) O blood _____
46) Three babies get mixed up in the hospital:
Baby #1 has type O blood.
Baby #2 has type A blood.
Baby #3 has AB blood.
Using the parent’s blood types below, determine which baby belongs to which of the parents.
The Washington’s
MOM: 0
DAD: A
The Lincoln’s
MOM: AB
DAD: B
The Kennedy’s
MOM: B (HET)
DAD: B
8
X-Linked Genes
In fruit flies, eye color is a sex linked trait. Red is dominant to white.
47) What are the sexes and eye colors of flies with the following genotypes:
X R X r _________________
X R X R _________________
X R Y _________________
X r Y _________________
48) What are the genotypes of these flies:
white eyed, male ____________
white eyed, female ___________
red eyed female (heterozygous) ________
red eyed, male ___________
49) Show the cross of a white eyed female X r X r with a red-eyed male X R Y.
How many are:
white eyed, male___
white eyed, female ___
red eyed, male ____
red eyed, female ____
50) Show a cross between a pure red eyed female and a white eyed male.
What are the genotypes of the parents:
___________& _______________
How many are:
white eyed, male___
white eyed, female ___
red eyed, male ____
red eyed, female ____
51) Show the cross of a red eyed female (heterozygous) and a red eyed male. What are the genotypes of the parents?
___________ & ________________
How many are:
white eyed, male___
white eyed, female ___
red eyed, male ____
red eyed, female ____
Math: What if in the above cross,
100 males were produced and 200
females.
How many total red-eyed flies
would there be?
9
52) In humans, hemophilia is a sex linked trait. Females can be normal, carriers, or have the disease. Males will either
have the disease or not (but they won’t ever be carriers)
= female, normal
= male, normal
= female, carrier
= male, hemophiliac
= female, hemophiliac
53) Show the cross of a man who has hemophilia with a woman who is a carrier.
a) What is the probability that their children will have the disease? __________
54) A woman who is a carrier marries a normal man. Show the cross.
a) What is the probability that their children will have hemophilia? ____
b) What sex will a child in the family with hemophilia be? ______
55) A woman who has hemophilia marries a normal man.
a)
How many of their children will have hemophilia, and what is their sex?
56) In cats, the gene for calico (multicolored) cats is codominant. Females that receive a B and an R gene have black
and orange splotches on white coats. Males can only be black or orange, but never calico.
Here’s what a calico female’s genotype would look like.
XB XR
a) Show the cross of a female calico cat with a black male?
i)
What percentage of the kittens will be black and male? _________
ii)
What percentage of the kittens will be calico and male? _________
iii) What percentage of the kittens will be calico and female? _________
10
Pedigrees and Genetic Traits Worksheet
Notes: A pedigree is a chart that shows the occurrence of a trait across several generations of a family. By analyzing a
pedigree, it is often possible to determine whether a trait is controlled by a dominant allele or a recessive allele and
whether it is autosomal or sex-linked
KEY
DD or Dd= dimples
dd= no dimples
57) The children of couple A and B are _______________________________
58) D is married to _____________
59) Who are the grandparents of G and H? ______________________________
60) Who has dimples? ______________________________Who doesn’t? ___________________
61) Is the gene for dimples dominant or recessive? How did you know? _______________________________
62) Is the gene for dimples autosomal or sex-linked? How did you know? ______________________________
SEX LINKED PEDIGREES
This Pedigree is for Duchesne Muscular Dystrophy a recessive gene on the X chromosome
63) Write The genotypes of all individuals N= Normal n= muscular dystrophy
64) Is Duchesne Muscular Dystrophy more likely to occur in males or females? Explain why?
65) Individual H is female with the disorder. How did she inherit the disorder?
66) Individual K has the disorder, yet his father did not. How is that possible?
67) Individual G does not have the disorder, yet his father does and his mother was a carrier. Explain how that
is possible.
68) Why is the genotype of the father not important when investigating Sex-linked traits inherited by sons?
11
BUDGET GENETIC COUNSELING CENTER
What are the three things that are wrong with this pedigree for being colorblind?
a) _____________________________________________
b) _____________________________________________
c) _____________________________________________
This is a pedigree for baldness. Affected individuals are often lose their hair later in life.
69) Label the generation numbers
70) Use your notes to help you figure out the genotypes of the numbered individuals
71) Challenge yourself by figuring out as many of the other individuals as possible
a.
b.
a.
b.
Is baldness a dominant or recessive trait? ______________________
Is baldness a autosomal or sex-linked trait? _____________________
What are the genotypes of the parents of individual #1 Mom_____________ Dad________
What is the genotype of person #1___________#2__________#3___________#4__________
This is a pedigree for tardiness. Affected individuals are often tardy to class.
72) Label the generation numbers
73) Use your notes to help you figure out the genotypes of the numbered individuals
74) Challenge yourself by figuring out as many of the other individuals as possible
a.
b.
c.
d.
Is tardiness a dominant or recessive trait? ______________________
Is tardiness an autosomal or sex-linked trait? _____________________
What allele symbol are you going to use for being tardy? _________ not tardy ___________
What is the phenotype of person
#1______________________genotype__________________
e. What are the phenotypes of the parents of individual #2 Mom_____________ Dad________
f. What is the phenotype of person
#3______________________genotype__________________
g. What is the genotype of person #4______________________#5__________________
REFLECTION: Create the following pedigree and Label each individual with their genotype
 Tongue rolling being able to roll your tongue is dominant to not being able to.
 A man and a woman get married. The man can roll his tongue, but the woman can’t. They have two girls that
can both roll their tongues.
 The man has two sisters. One can roll her tongue the other can’t. Both of his parents can roll their tongues.
 The woman has three brothers two of them can roll their tongues, one can’t. Her mother can’t roll her tongue,
but her father can.
 The two girls get married and have kids of their own. The older girl has twin sons who can’t roll their tongues.
 The younger sister marries a man that can’t roll his tongue. They have two tongue rolling girls and a son that
can’t.
12
GENETICS STUDY GUIDE
1)
What is a gene? ______________________________________________________
2)
What is an allele? _____________________________________________________
3)
Explain the difference between a gene and an allele.
___________________________________________________________________________________________
___________________________________________________________________
4)
Who is the Father of Genetics? ____________________
5)
What are the two types of crosses that we can give him credit for solving? __________________ and
____________________________
6)
What does the Law of Segregation mean?
___________________________________________________________________________________________
___________________________________________________________________
7)
What does the Law of Independent Assortment mean?
________________________________________________________________________________________
______________________________________________________________
8)
Do all crosses follow the rules established my Mendel’s work with Pea Plants? ________
Give some examples!
9)
a.
____________
b.
____________
c.
_____________
What does probability mean? __________________________________________________
10) What is the formula we use to figure out probability?
__________________________________________________
a.
What is the probability of having a boy or a girl? ____________
b.
What is the probability of having a boy and a girl? ____________
c.
What are the three different ways you can write a probability?
__________________________________________________
11) What does the term Heterozygous mean? _____________________________________________________
12) What does the term Homozygous mean? _____________________________________________________
13) Using A’s, what is the genotype for a person that is….
a.
Heterozygous _________
b.
Homozygous dominant _________
14) What is the actual difference between dominant and recessive alleles? HINT: mRNA
___________________________________________________________________________________________
___________________________________________________________________
15) Why do we use capital and lower case letters to represent the alleles?
___________________________________________________________________________________________
___________________________________________________________________
16) What is a genotype? ______________________________________________
17) What is a phenotype? _____________________________________________
18) What is a Punnet square? Why do we use it?
___________________________________________________________________________________________
19) What is a gamete? _____________________________
20) What is actually being represented by the letters that we put for the mother and father?
___________________________________________________________________________________________
_________________________________________________
21) What is represented by the inside boxes? ____________________
22) What does the F 1 stand for? ________________
23) What does the F 2 stand for? ________________
24) What is the type of inheritance we see in Snap Dragons? ______________________
a.
What color are the Heterozygous? __________________
b.
Why? _______________________________________________
c.
How can you be sure you choose the right type of dominance?
____________________________________________________
25) What do we call it when many allele sets control a trait? __________________
26) What is an example of this? _________________________
27) What is the type of dominance that controls Blood type? ________________________
28) Fill out the table
BLOOD TYPE
GENOTYPE POSSIBILITIES
A
B
AB
0
29) What is the normal genotype of a female ________
30) What is the normal genotype of a male ________
31) What do we call traits that are carried on the X chromosome? ______________
32) What is an example of a sex-linked Genotype of a Female? _______Male? _______
33) How many alleles to men have for Sex Linked Traits? ___________
a)
WHY? ___________________________________________________________
34) Give an example of a sex-linked trait. ____________________________________
35) What are Sex Limited Trait’s?
___________________________________________________________________________________________
36) Give an example for one in each Sex (gender)
a)
___________________
b)
___________________
37) Does the environment effect gene expression? ______________
a)
What are some examples?
i) ________________________________
ii) ________________________________
iii) ________________________________
38) For the following table, mark the box with an X if it applies to the traits listed
Simple
Dominance
INHERITANCE
PATTERN
Incomplete
Dominance
Multiple
Alleles
Codominance
Polygenic
Sex-linked
Hair Color
Blood Type
Eye Color
Sickle Cell Anemia
Skin Color
Snap Dragon Color
Human Height
Colorblindness
PUNNETT SQUARE PRACTICE
MAKE SURE YOU INCLUDE ALL 6 STEPS!
39) Tongue curling is dominant to not being able to curl tongue.
a)
What is the phenotypic and genotypic ratio of a dominant male with a recessive female?
b)
What is the ratio of a heterozygous male with a heterozygous female
40) If Black is dominant to white in rats, what would the genotype be of a rat that is white?
a.
Why is it white ( be specific) ____________________________________
b.
What would the rat look like if its genotype was Ww? _____________________
41) In gerbil coat color, black is dominant and brown is recessive. Black male mates with a brown female and produces
10 offspring. Four offspring are black and 6 offspring are brown.
a.
What genotype is the father? _______________
b.
What is a test cross? ________________________________
c.
Prove it with a Punnet square!
42) In Snapdragons red flowers are dominant to white flowers. Cross a red flower and a white flower.
a) What type of dominance is this?
b)
Cross any two of the offspring of the above cross.
i) What is the new phenotype ratio? ___________
43) A father has sickle cell anemia, and marries a woman that has normal blood cells. What are the chances of their
child having Sickle Cell anemia? ___________
a)
Show the cross!
44) A certain couple had a child with O blood type, but they are A type and B type.
a)
Is this possible? Explain!
45) Another couple had a child the same day at the same hospital. There are A and AB… Could this child with 0 type be
theirs?
46) Color Blindness is a genetic disorder. The mother is a carrier for the disorder and the father is normal, what are the
chances that the son will be colorblind? ________________
a)
b)
c)
What kind of inheritance is this? _________
Can a women be colorblind? ______
Explain: _______________________________
47) A man is normal but marries a woman that is a carrier for hemophilia… What are the chances that their child will have
hemophilia?
48) In guinea pigs, the allele for rough coat (R) is dominant to the allele for smooth coat (r), and the allele for black fur (B) is
dominant to the allele for white fur (b). Mate a heterozygous rough black guinea pig and a smooth white guinea pig.
a)
What are the possible eggs and sperm? (FOIL)
b)
What are the Phenotype ratios?
______________ X _______________
56) In the following pedigrees
a) Label each generation and individual
b) Label each individual with the corresponding genotype
c) State whether the condition is dominant or recessive.
d) Sex linked or autosomal
C________________
D________________
C________________
D________________
C________________
D________________