Campbell Biology
Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON

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Chapter 14, Problem 5TYU

Flower position, stem length, and seed shape are three characters that Mendel studied. Each is controlled by an independently assorting gene and has dominant and recessive expression as indicated in Table 14.1. If a plant that is heterozygous for all three characters is allowed to self-fertilize, what proportion of the offspring would you expect to be each of the following? (Note: Use the rulesof probability instead of a huge Punnett Square.)

(a) homozygous for the three dominant traits

(b) homozygous for the three recessive traits

(c) heterozygous for all three characters

(d) homozygous for axial and tall, heterozygous for seed shape

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Mendel crossed peas having round seeds and yellow cotyledons (seed leaves) with peas having wrinkled seeds and green cotyledons. All the F1 plants had round seeds with yellow cotyledons. Diagram this cross through the F2 generation, using both the Punnett square and forked-line, or branch diagram, methods.
Gray seed color in peas is dominant to white.  Assume that Mendel conducted a series of experiments where plants with gray seeds were crossed with each other and the following progeny were produced:  320 gray and 80 white.  (a) What is the most probable genotype of each parent?  (b)  Based on your answer in (a) above, what genotypic and phenotypic ratios are expected in the progeny?
Mendel testcrossed pea plants grown from yellow, round F1 seeds to plants grown from green, wrinkled seeds and obtained the following results: 31 yellow, round; 26 green, round; 27 yellow, wrinkled; and 26 green, wrinkled. Are these results consistent with the hypothesis that seed color and seed texture are controlled by independently assorting genes, each segregating two alleles?

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Campbell Biology

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