Campbell Biology: Custom Edition
Campbell Biology: Custom Edition
18th Edition
ISBN: 9781323717271
Author: Urry, Cain, Wasserman, Minorsky, Reece
Publisher: PEARSON C
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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 crossed pea plants that produced round seeds with those that produced wrinkled seeds.  From a total of 7324 F2 seeds, 5474 were round and 1850 were wrinkled.  Using the symbols W and w for genes, (a) symbolize the original P cross;  (b) the gametes; and (c) F1 progeny, (d) Represent cross between two F1 plants (or one selfed); (e) symbolize the gametes; and (f) summarize the expected F2 results under the headings: phenotypes, genotypes, genotypic frequency, and phenotypic ratio.

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Campbell Biology: Custom Edition

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