1. T. Trimpe 2008 http://sciencespot.net/
Punnett Practice #1
T. Trimpe

2. 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. ______
(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. 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? TT Tt T t T TT Tt
100% 0%

4. 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? Tt T t T t TT Tt tt
75%
25%
25% of 100 = 25 plants