BW
HAVE SLATE, MARKER & ERASER ON DESK,
& SEPARATE SHEET OF PAPER
MUST WORK QUICKLY & STAY ON TASK!
1. If Cabs baseball is dominant over Falcons
baseball: (B & b)
a. Write the genotype for a
heterozygous father.
b. Write the genotype for a
homozygous recessive mother.
c. Draw a punnett square to show
the possibilities for their offspring.
d. What are the genotype frequencies for
offspring? (use vocab)
e. What are the phenotype frequencies?
***Review your genetics notes when finished
BW ANSWERS
A. Bb (heterozygous)
B. bb (homozygous recessive)
C. (Punnett Square)
D. 50% homozygous recessive
50% heterozygous
E. 50% Falcons
50% Cabs
THIS WEEK:
Wednesday: Punnet square practice,
Codominance, Incomplete dominance worksheest
Thursday: Review genetics, quiz on VOCAB
Friday: Genetic Disease brochure due
All genetic worksheets due (binder check)
*I will have your notebooks graded over the
weekend- sorry it has been a MONTH! 
Gregor Mendel (1822- 1884)
“FATHER
OF
GENETICS”
-experiments with pea plants led to
understanding of dominant vs recessive
-experiments unappreciated during his time,
died in 1884 due to kidney failure
DO ALL ORGANISMS FOLLOW MENDEL’S
LAW OF DOMINANCE?
 How
does skin
color work in
humans?
What about height?
CODOMINANCE
What does the prefix “co”
mean? (hint: Coworkers,
Cooperation, Co-captains…)
CODOMINANCE:
In
heterozygous
genotypes, both of the
alleles are expressed
TOGETHER in the
phenotype.
Uses only capital letters
RED x WHITE
= RED&WHITE
What
is the genotype
for a black cow?
BB
What
is the genotype
for a white cow?
WW
What
is the genotype for a
black AND white cow??
BW
P= BB X WW
(do the Punnett square)
F1= 100% BW
BLOOD TYPES
3 BLOOD TYPE RULES- WRITE ON SIDE OF
BLOOD TYPE HANDOUT
Parent’s Blood
Types
Parent’s Possible
Genotypes
Offsprings’
Possible
Genotypes
Offsprings’
Possible Blood
Types
Offsprings’ Blood
Types NOT
Possible
A
O
AA, Ao
oo
Ao, oo
A, O
B, AB
A
B
AA, Ao
BB, Bo
AB, Ao, Bo, oo
AB, A, B, O
none
AB
O
AB
oo
Ao, Bo
A, B
AB, O
B
O
BB, Bo
oo
Bo, oo
B, O
A, AB
AB
A
AB
AA, Ao
AA, AB, Ao, Bo
A, B, AB, O
none
AB
B
AB
BB, Bo
AB, BB, Ao, Bo
A, B, AB, O
none
O
O
oo
oo
oo
O
A, B, AB
AB
AB
AB
AB
AA, BB, AB
A, B, AB
O
A
A
AA, Ao
AA, Ao
AA, Ao, oo
A, O
B, AB
Rule 1
Both
A and B alleles are
dominant over o.
So, individuals who have an
Ao genotype will have an A
phenotype.
The
RULE 2
A and B
alleles are
codominant.
Therefore, if an
A is inherited
from one parent
and a B from the
other, the
phenotype will
be AB.
Rule: 3
People
who are type O
have oo genotypes.
In other words, they
inherited a recessive o
allele from both
parents.
PRACTICE

What are the phenotypes of the following genotypes?

AA


Bo


Type B (o is recessive)
Homozygous recessive


Type A
Type O
AB

Type AB (codominant)
PUNNETT SQUARE
You
perform blood crosses
just the same way as you
would any other Punnet
Square.
 Example: Ao Mom and a
by vote of fingers, how many
Bo Dad Show
offspring genotypes are possible?
4 = (Ao, Bo, AB, oo)
BLOOD TYPE WORKSHEET
Parent’s Blood
Types
Parent’s Possible
Genotypes
A
O
AA, Ao
oo
A
B
AA, Ao
BB, Bo
AB, Ao, Bo, oo
AB, A, B, O
none
AB
O
AB
oo
Ao, Bo
A, B
AB, O
B
O
BB, Bo
oo
Bo, oo
B, O
A, AB
AB
A
AB
AA, Ao
AA,
AB,did
Ao, a
BoPunnett
A, B, AB, O
They
none
AB
B
AB
BB, Bo
Square for all potential
AB, BB, Ao, Bo
crosses: A, B, AB, O
none
O
O
oo
oo
AB
AB
?
?
Offsprings’
Possible
Genotypes
Ao, oo
?
Offsprings’
Possible Blood
Types
A, O
?
Offsprings’ Blood
Types NOT
Possible
B, AB
?
oo
O
A, B, AB
AB
AB
AA, BB, AB
A, B, AB
O
A
A
AA, Ao
AA, Ao
AA, Ao, oo
A, O
B, AB
B
B
BB, Bo
BB, Bo
BB, Bo, oo
B, O
A, AB
AA x oo AND Ao x oo
GUIDED PRACTICE
Parent’s Blood
Types
Parent’s Possible
Genotypes
Offsprings’
Possible
Genotypes
Offsprings’
Possible Blood
Types
Offsprings’ Blood
Types NOT
Possible
A
O
AA, Ao
oo
Ao, oo
A, O
B, AB
A
B
AA, Ao
BB, Bo
AB, Ao, ?Bo, oo
AB, A, B,
?O
none
AB
O
AB
oo
Ao, Bo
A, B
AB, O
B
O
BB, Bo
oo
Bo, oo
B, O
A, AB
AB
A
AB
AA, Ao
AA, AB, Ao, Bo
A, B, AB, O
none
AB
B
AB
BB, Bo
O
O
oo
oo
AB
AB
AB
AB
A
A
AA, Ao
AA, Ao
AA, Ao, oo
A, O
B, AB
B
B
BB, Bo
BB, Bo
BB, Bo, oo
B, O
A, AB
?
?
Show your work (in
notebook)
allB, AB, O
AB,
BB, Ao, Bo for A,
potential crosses:
AA x BB O
oo
Ao x BB
AA, BB,AA
AB x Bo A, B, AB
Ao x Bo
?
none
A, B, AB
O
CONTINUE THE BLOOD TYPE PRACTICE
PROBLEMS (DO PUNNETS IN NOTEBOOK)
ANSWER KEY
Parent’s Blood
Types
Parent’s Possible
Genotypes
Offsprings’
Possible
Genotypes
Offsprings’
Possible Blood
Types
Offsprings’ Blood
Types NOT
Possible
A
O
AA, Ao
oo
Ao, oo
A, O
B, AB
A
B
AA, Ao
BB, Bo
AB, Ao, Bo, oo
AB, A, B, O
none
AB
O
AB
oo
Ao, Bo
A, B
AB, O
B
O
BB, Bo
oo
Bo, oo
B, O
A, AB
AB
A
AB
AA, Ao
AA, AB, Ao
A, B, AB
O
AB
B
AB
BB, Bo
AB, BB, Bo
A, B, AB
O
O
O
oo
oo
oo
O
A, B, AB
AB
AB
AB
AB
AA, BB, AB
A, B, AB
O
A
A
AA, Ao
AA, Ao
AA, Ao, oo
A, O
B, AB
B
B
BB, Bo
BB, Bo
BB, Bo, oo
B, O
A, AB
INCOMPLETE
DOMINANCE
What do you think
“incomplete” dominance
looks like?
INCOMPLETE DOMINANCE
In
the heterozygous genotype,
the alleles are BLENDED in the
phenotype
Uses only capital letters
Red flower x white flower
= Pink flower
SLATE PRACTICE…
BB
= blue
YY = yellow
BY = green
What would be the genotype of
GREEN flowers?
(green is a color that is
“inbetween” yellow and blue)
Do a Punnett
Square cross
between 2
green flowers
INCOMPLETE DOMINANCE
Practice with the spongebob
worksheet.
Both handouts due Friday. Turn
in early for extra credit.
HETEROCHROMIA IRIDIS


chimerism, where two
or more genotypes arise
from the fusion of more
than one fertilized
zygote in the early
stages of embryonic
development.
In genetics, a
mosaic or
mosaicism denotes
the presence of two
or more populations
of cells with
different genotypes
in one individual
who has developed
from a single
fertilized egg
CLOSURE
Do a Venn Diagram with the similarities and
differences between codominance & incomplete
dominance
HTTPS://WWW.WNYC.ORG/RADIO/#/ONDEMAN
D/91597

RadioLab (5:26-14:00)
Vocab Quiz
1.
2.
3.
4.
Allele
Genotype
Heterozygous
Homologous
Chromosomes
5. Phenotype
6. Recessive
7. Dominant
8. Punnett Square
9. Homozygous
10. Genetics
A. Genotype with 2 different alleles (Bb)
B. The allele that is ALWAYS expressed in the
phenotype, even if only one is present
C. The alleles that a person has, their genetic
makeup
D. The allele that is ONLY expressed in the
phenotype if both are the same
E. A pair of chromosomes that has genes for the
same TRAITS, but may have different alleles
F. A chart that predicts allele combinations
G. The physical appearance of an organism
H. A genotype with two of the same alleles (BB
or bb)
I. The study of heredity (inheritance)
J. A version of a gene
Trade & Grade
1. J
2. C
3. A
4. E
5. G
6. D
7. B
8. F
9. H
10. I