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)
Ch. 25 - Cloning can be done by somatic cell nuclear...Ch. 25 - If the DNA content of a diploid cell in the G1...Ch. 25 - Prob. 25.3CCCh. 25 - Prob. 1QCh. 25 - Prob. 25.4CCCh. 25 - What do you think would happen to a pathogenic...Ch. 25 - Prob. 25.6CCCh. 25 - The Truth About Sex. For each of the following...Ch. 25 - Ordering the Phases of Meiosis. Drawings of...Ch. 25 - Telling Them Apart. Briefly describe how you might...
Ch. 25 - Prob. 25.4PSCh. 25 - More about DNA. Let X be the amount of DNA present...Ch. 25 - Meiotic Mistakes. Infants born with Patau syndrome...Ch. 25 - Prob. 25.7PSCh. 25 - QUANTITATIVE Punnett Squares as Genetic Tools. The...Ch. 25 - QUANTITATIVE Genetic Mapping. The following table...Ch. 25 - Prob. 25.10PSCh. 25 - Prob. 25.11PS
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