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?
(d) What is the probability that a plant would be short?
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?
25% of 100 = 25 plants