Tuesday, December 6, 2011
Name: ____________________________________ Period: ____
Describe heredity as the passage of instructions from one generation
Competency
to another and recognize that heredity information is contained in
3d – DOK 2
genes, located in the chromosomes of each cell.
8th Grade –
I can calculate percentages and numbers of offspring with a specific
Lesson 5.5
genotype and phenotype.
Page
5
Unit 5 – Heredity and Genetics: Percentages, Numbers, and Punnett Squares
Quick Review
A substance turns red litmus paper blue. It also dissociates very easily in water. Use this
information to answer the following questions.
1. How could this substance be classified? base
2. What is the range of possible pH for the substance? >7
3. When the substance is mixed with water, it releases what atom or molecule? OH4. What two groups on the periodic table could it be made from? Alkali metals and alkali
earth metals
5. This substance is a (strong or weak) (acid or base).
Key Points on Percentages, Numbers, and Punnett Squares
1. What
a. A Punnett square can be used to determine the chance of a single offspring
having a certain genotype or phenotype.
b. If a cross produces a large number of offspring, a Punnett square can also be used
to predict the number of offspring with a certain genotype or phenotype.
2. How
Plankton, a character from SpongeBob, is
a. Write down the genotypes of the
green in color. This trait is given by the
parents that are being crossed.
b. Fill in the Punnett square according to dominant allele of the color gene in his
species. The recessive allele gives a pink
the instructions in lesson 5.4
organism. If Plankton, a heterozygote, is
c. Determine the specific phenotype or
crossed with a pink plankton, what chance
genotype the question is asking you to
will their offspring have of being pink?
determine.
Cross:
X
d. Create a ratio for this phenotype of
genotype.
Punnett Square:
e. Convert to number or percentage
i. Chance that a single offspring
will have the given phenotype
of genotype = percentage.
a) Convert fraction to a
decimal
b) Move decimal two places
Trait of offspring being studied:
right and add percent
sign.
ii. Number of offspring with a trait =
Ratio:
setup proportion using the ratio
Number of Offspring or Percentage Chance?
and the total number of
Answer:
offspring.
Tuesday, December 6, 2011
Name: ____________________________________ Period: ____
Describe heredity as the passage of instructions from one generation
Competency
to another and recognize that heredity information is contained in
3d – DOK 2
genes, located in the chromosomes of each cell.
th
8 Grade –
I can calculate percentages and numbers of offspring with a specific
Lesson 5.5
genotype and phenotype.
Page
5
Unit 5 – Heredity and Genetics: Percentages, Numbers, and Punnett Squares
Quick Review
A substance turns red litmus paper blue. It also dissociates very easily in water. Use this
information to answer the following questions.
1. How could this substance be classified?
2. What is the range of possible pH for the substance?
3. When the substance is mixed with water, it releases what atom or molecule?
4. What two groups on the periodic table could it be made from?
and
5. This substance is a (
or weak) (acid or
).
Key Points on Percentages, Numbers, and Punnett Squares
1. What
a. A Punnett square can be used to determine the
of a
having a certain
or
.
b. If a cross produces a large number of offspring, a Punnett square can also be used
to
the number of offspring with a certain
or
.
2. How
a. Write down the
of the Plankton, a character from SpongeBob, is
green in color. This trait is given by the
parents that are being
.
dominant allele of the color gene in his
b.
the Punnett square
according to the instructions in lesson 5.4 species. The recessive allele gives a pink
organism. If Plankton, a heterozygote, is
c. Determine the
crossed with a pink plankton, what chance
or
the question is asking
will their offspring have of being pink?
you to determine.
Cross:
X
d. Create a
for this phenotype of
Punnett Square:
genotype.
e. Convert to
or
i. Chance that a
will have the
given phenotype of genotype =
.
a) Convert
to a
Trait of offspring being studied:
b) Move decimal
places
and add percent
. Ratio:
ii. Number of offspring with a trait =
Number of Offspring or Percentage Chance?
setup
using the
Answer:
and the
number of
.
Tuesday, December 6, 2011
Name: ____________________________________ Period: ____
Punnett Square Introduction: Guided Practice
Gene
Body Shape
Body Color
Eye Shape
Nose Style
Dominant Allele
SquarePants (S)
Yellow (Y)
Round (R)
Long (L)
SpongeBob’s aunt and uncle,
SpongeWilma and SpongeWilbur, have
different shaped eyes. Wilma is believed
to be homozygous for her round eyes,
while Wilbur has oval eyes. If Wilma and
Wilbur have eight children how many
would be expected to have oval eyes?
Recessive Allele
RoundPants (s)
Blue (y)
Oval (r)
Stubby (l)
If SpongeBob and his new wife, SpongeSusie,
are both heterozygous for yellow body color,
what is the percentage chance that their
offspring will be blue?
Punnett Square Introduction: Independent Practice
1. SpongeBob’s aunt is famous around town for her itty, bitty stubby nose! She recently met
a fellow who also has a stubby nose. What chance would their offspring have of being
homozygous dominant?
2. SpongeBob and his wife, SpongeSusie, are carriers of the recessive RoundPants allele.
SpongeSusie has found out she is pregnant. What is the chance that they will have a
RoundPants child?