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Punnett Practice

Practice genetic prediction using Punnett squares for pea plants. Calculate probabilities and expected outcomes for offspring.

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Punnett Practice

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

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

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

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