Download Hybrid Tall


Words to know:
 Probability: a number that describes how
likely it is for something to happen
 Pure bred: offspring that have the same
alleles
 Hybrid: offspring has two different alleles
for each trait
 Genotype: genetic make up; allele
combination
 Phenotype: physical appearance
T. Trimpe 2008 http://sciencespot.net/
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? _______ %
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?
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? 100%
(d) What is the probability that a plant would be short?
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?
(d) What is the probability that a plant would be short?
75%
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
T. Trimpe 2008 http://sciencespot.net/
1. Predict the offspring from a cross between a purebred pea plant with purple
flowers and a pea plant with white flowers. Use P for purple and p for white.
(a) Give the genotypes.
Purebred 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? _______ %
2. If you crossed two hybrid plants with purple flowers and planted 200 of the
seeds, how many would you expect to have with white flowers. Create a Punnett
square to support your answer.
1. Predict the offspring from a cross between a purebred pea plant with purple
flowers and a pea plant with white flowers. Use P for purple and p for white.
(a) Give the genotypes.
PP
Purebred Purple = ____
pp
White = ____
(b) Create a Punnett square to determine the genotypes for the offspring.
p
p
P
Pp
Pp
P
Pp
Pp
(c) What is the probability that a plant would have purple flowers? 100%
(d) What is the probability that a plant would have white flowers?
0%
2. If you crossed two hybrid plants with purple flowers and planted 200 of the
seeds, how many would you expect to have with white flowers. Create a Punnett
square to support your answer.
P
p
P
PP
Pp
p
Pp
pp
You would expect to see white flowers
on 25% of the plants, which would be
50 plants.
T. Trimpe 2008 http://sciencespot.net/
Some people have dimples, while others do not. The presence of dimples is a
dominant trait (D), while not having dimples is recessive (d).
(1) 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: _______
(2) What is the probability that a second child won’t have dimples? Create a
Punnett square to support your answer.
Some people have dimples, while others do not. The presence of dimples is a
dominant trait (D), while not having dimples is recessive (d).
(1) 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: _______
(2) What is the probability that a second child
won’t have dimples? Create a Punnett square
to support your answer.
There would be a 50% probability that
the second child would not have dimples.
d
d
D
Dd Dd
d
dd
dd