Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 25, Problem 25.8PS
QUANTITATIVE Punnett Squares as Genetic Tools. The genetic characters of seed color (where Y is the allele for yellow seeds and y for green seeds) and seed shape (where R is the allele for round seeds and r for wrinkled seeds) were used by Mendel in some of his crosses.
- (a) Mendel performed a one-factor cross between parent plants that were both heterozygous for seed color Yy × Yy. Using a Punnett square, explain the 3:1
phenotypic ratio Mendel observed for the offspring of such a cross. - (b) Mendel went on to perform a two-factor cross between plants heterozygous for both seed color (Yy) and seed shape (Rr). How does the Punnett square of Figure 25-26 reflect Mendel’s law of independent assortment?
- (c) Complete the Punnett square of Figure 25-26 by writing in each of the possible progeny genotypes. How many different genotypes will be found in the progeny? In what ratios?
- (d) For the case of Figure 25-26, how many different phenotypes will be found in the progeny? In what ratios?
Figure 25-26 Punnett Squares. See Problem 25-8.
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Chapter 25 Solutions
Becker's World of the Cell (9th Edition)
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