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Directions:
1. Print task cards (2 per page, pages 2-13)
2. Students will complete one card at a time.
3. You can use white boards or paper
4. Answer keys are at the bottom.
Or
1. Print slides 2-13 6 up as practice for students
2. Use ppt to review
1. Predict the offspring from a cross between a purebred tall pea
plant and a hybrid tall plant.
Use T for tall and t for short.
(a) Give the genotypes. Purebred Tall = ____
Hybrid Tall = ____
(b) Create a Punnett square to determine the genotypes for the
offspring.
(c) What is the probability that a plant
would be tall? _______ %
(d) What is the probability that a plant
would be short? _______ %
(e) What is the genotypic ratio? __________
2. Predict the offspring from a cross between two hybrid tall
pea plants.
(a) Give the genotype for a hybrid tall plant. ______
(b) Create a Punnett square to determine the genotypes for the
offspring.
(c) What is the probability that a plant
would be tall? _____ %
(d) What is the probability that a plant
would be short? _____ %
(e) If you were to plant 100 seeds from this cross,
how many would you expect to be tall? _____
3. Predict the offspring from a cross between a homozygous pea
plant with purple flowers and a pea plant with white flowers.
Use P for purple and p for white.
(a) Give the genotypes. Homozygous Purple = ____
White = ____
(b) Create a Punnett square to determine
the genotypes for the offspring.
(c) What is the probability that a plant
would have purple flowers? _______ %
(d) What is the probability that a plant
would have white flowers? _______ %
4. If you crossed two hybrid plants with purple flowers and
planted 200 of the seeds, how many would you expect to have
white flowers? Create a Punnett square to support your
answer.
5. Some people have dimples, while others do not. The presence
of dimples is a dominant trait (D), while not having dimples is
recessive (d).
Susie has dimples, but her husband, Tom, does not. Their
first child has his father's phenotype. What are the genotypes
of the mother, father, and child?
Mother’s Genotype: _______
Father’s Genotype: _______
Son’s Genotype: _______
What is the probability that a second child
won’t have dimples? _________
In Dalmatians, the trait for black spots (B)is dominant
over the recessive trait for no spots. Use this
information to answer these questions.
6. Two Dalmatians with black spots have puppies. One of the
dogs is homozygous for black spots, while the other is
heterozygous. Out of a litter of 4 puppies, how many would you
expect to have no spots? Create a Punnett square to support
your answer.
In Dalmatians, the trait for black spots (B) is dominant
over the recessive trait for no spots. Use this
information to answer these questions.
7. Two spotted Dalmatians had a large litter of 10 puppies.
Seven of them have black spots, while 3 do not. What would the
genotypes of the two parents need to be for this result?
________________
Create a Punnett square to support your answer.
8. One of SpongeBob’s cousins with hybrid round eyes (Rr) had
children with someone who also had hybrid round eyes (Rr).
Oval eyes is the recessive characteristic.
(a) Create a Punnett square to show the possible offspring that
would result from this cross.
(b) Give the genotypes and phenotypes of the offspring.
(c) What percentage of the children should have round eyes?______
9. Another of SpongeBob’s cousins with hybrid round eyes (Rr)
had children with someone who has oval eyes (rr).
(a) Create a Punnett square to show the possible offspring that
would result from this cross.
(b) Give the genotypes and phenotypes of the offspring.
(c) What percentage of the children should have round eyes?______
10. In cats, black fur (B) is dominant over white fur(b). A black female cat is mated with a white male cat. All of
the kittens produced will always be black.
a. What is the genotype of the white male?_____________
b. What gene did all the kittens inherit from the father?________
c. What gene did all the kittens inherit from the mother in order to be black?_______
d. What is the only genotype for the mother that would give all black kittens?______
e. Draw out the Punnett Square for this cross.
f. Is the mother cat homozygous or heterozygous?
g. Is the father cat homozygous or heterozygous?
h. Are the kittens homozygous or heterozygous?
i. What is the genotype of the kittens? _____________
11. Another black female cat is mated to the white male. Four kittens result
from this new feline fling. Two kittens are white, two kittens are black.
a.Work out the cross for these two parents. Use the cross to answer the questions
b. What is the genotype of the white male?__________
c. What is the genotype of the mother? ________
d. What is the genotype of the black kittens?__________
e. What is the probability of producing a white kitten from this cross? _______
f. What is the phenotypic ratio? ____________
g. What is the genotypic ratio? ______________
In humans, the ability to taste the chemical phenylthiocarbonide is a dominant
trait (T). People who cannot taste the chemical are called non-tasters and
exhibit the recessive phenotype (t). Lola returns to Atlanta with her four-year
old daughter, and is bringing child support charges against her old boyfriend
Herman. Lola claims Herman is the father of the child. Herman claims that he
is not the perpetrator and denies his fatherhood of the child. Lola is a nontaster, Herman is a non-taster, and the child is a taster.
a. What is Lola’s genotype?___________
b. What is Herman’s genotype?___________
c. Work out the cross between these two characters,
and list the possible offspring they could produce.
d. According to the cross, what is the probability of the producing a non-taster
child?______
e. What is the probability of the two producing a taster child?___________
f. Which person is lying about all the hanky-panky?__________________
1. Predict the offspring from a cross between a purebred tall pea plant and a
hybrid tall plant. Use T for tall and t for short.
(a) Give the genotypes.
TT
Purebred Tall = ____
Tt
Hybrid Tall = ____
(b) Create a Punnett square to determine the genotypes for the offspring.
T
t
T TT Tt
T TT
Tt
(c) What is the probability that a plant would be tall?
(d) What is the probability that a plant would be short?
(e) What is the genotypic ratio?
1:1
100%
0%
2. Predict the offspring from a cross between two hybrid tall pea plants.
Tt
(a) Give the genotype for a hybrid tall plant. ______
(b) Create a Punnett square to determine the genotypes for the offspring.
T
t
T TT Tt
t
Tt
tt
(c) What is the probability that a plant would be tall?
75%
(d) What is the probability that a plant would be short?
25%
(e) If you were to plant 100 seeds from this cross, how many would you expect to
be tall?
75% of 100 = 75 plants
3. Predict the offspring from a cross between a homozygous pea plant with
purple flowers and a pea plant with white flowers. Use P for purple and p for
white.
PP
pp
(a) Give the genotypes. Homozygous Purple = ____
White = ____
(b) Create a Punnett square to determine the genotypes for the offspring.
p
p
P
Pp
Pp
P
Pp
Pp
100%
(c) What is the probability that a plant would have purple flowers?
(d) What is the probability that a plant would have white flowers?
0%
4. If you crossed two hybrid plants with purple flowers and planted 200 of the
seeds, how many would you expect to have white flowers. Create a Punnett
square to support your answer.
P
P
p
p
PP Pp
Pp
pp
You would expect to see white flowers
on 25% of the plants, which would be
50 plants.
5. Some people have dimples, while others do not. The presence of dimples is a
dominant trait (D), while not having dimples is recessive (d).
Susie has dimples, but her husband, Tom, does not. Their first child has his
father's phenotype. What are the genotypes of the mother, father, and child?
Dd
Mother’s Genotype: _______
dd
Father’s Genotype: _______
dd
Son’s Genotype: _______
What is the probability that a second child
won’t have dimples? Create a Punnett square
to support your answer.
d
d
D Dd Dd
There would be a 50% probability that the
second child would not have dimples.
d
dd
dd
6. Spots in Dalmatians is a dominant characteristic. Two Dalmatians with
black spots have puppies. One of the dogs is homozygous for black spots, while
the other is heterozygous. Out of a litter of 4 puppies, how many would you
expect to have no spots? Create a Punnett square to support your answer.
B
B
B BB BB
b
Bb Bb
None of them would be all white, since all
the offspring would have black spots.
7. Two spotted Dalmatians had a large litter of 10 puppies. Seven of them have
black spots, while 3 do not. What would the genotypes of the two parents need
to be for this result? Create a Punnett square to support your answer.
B
B
B
B
B
b
B BB BB
B BB BB
B BB Bb
Bb Bb
B BB BB
b
b
The parents would both have to be Bb or
heterozygous for black spots in order to have 7 out
of 10 or about 75% of puppies with black spots.
Bb
bb
8. One of SpongeBob’s cousins with hybrid round eyes (Rr) had children with
someone who also had hybrid round eyes (Rr). Oval eyes are recessive.
A. Create a Punnett square to show the possible offspring that would result from
this cross.
R
r
R RR Rr
r
Rr
rr
B. Give the genotypes and phenotypes of the offspring.
RR = Round eyes
Rr = Round eyes
rr = Oval eyes
C. What percentage of the children should have round eyes?
D. What is the phenotypic ratio?
3:1
75%
9. One of SpongeBob’s cousins with hybrid round eyes (Rr) had children with
someone who has oval eyes (rr).
A. Create a Punnett square to show the possible offspring that would result from
this cross.
r
r
R Rr
Rr
rr
rr
r
B. Give the genotypes and phenotypes of the offspring.
C. What percentage of the children should have round eyes?
Rr = Round eyes
rr = Oval eyes
50%
10. In cats, black fur (B) is dominant over white fur(b). A black female cat is
mated with a white male cat. All of the kittens produced will always be black.
•What is the genotype of the white male?_____________
bb
b
•What gene did all the kittens inherit from the father?________
•What gene did all the kittens inherit from the mother in order to be
black?_________
B
•What is the only genotype for the mother that would give only black
kittens?_________
BB
•Draw out the Punnett Square for this cross.
B
B
b
Bb
Bb
b
Bb
Bb
•Is the mother cat homozygous or heterozygous?
•Is the father cat homozygous or heterozygous?
•Are the kittens homozygous or heterozygous?
•What is the genotype of the kittens? Bb
11. Another black female cat is mated to the white male. Four kittens result
from this new feline fling. Two kittens are white, two kittens are black.
•Work out the cross for these two parents. Use the cross to answer the questions
B
b
b
Bb
bb
b
Bb
bb
bb
a. What is the genotype of the white male?__________
Bb
b. What is the genotype of the mother? ________
Bb
c. What is the genotype of the black kittens?__________
50%
d. What is the probability of producing a white kitten from this cross? ________
1:1
e. What is the phenotypic ratio? _____________
1:1
f. What is the genotypic ratio? ______________
In humans, the ability to taste the chemical phenylthiocarbonide is a dominant
trait (T). People who cannot taste the chemical are called non-tasters and
exhibit the recessive phenotype (t). Lola returns to Atlanta with her four-year
old daughter, and is bringing child support charges against her old boyfriend
Herman. Lola claims Herman is the father of the child. Herman claims that he
is not the perpetrator and denies his fatherhood of the child. Lola is a nontaster, Herman is a non-taster, and the child is a taster.
t
tt
What is Lola’s genotype?___________
tt
What is Herman’s genotype?___________
t
t
tt
tt
t
tt
tt
Work out the cross between these two characters,
and list the possible offspring they could produce.
According to the cross, what is the probability of the producing a non-taster
100%
child?______
0%
What is the probability of the two producing a taster child?___________
Lola
Which person is lying about all the hanky-panky?__________________