Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 12, Problem 3Q
Summary Introduction
To review:
The
Figure 1: Distance between different genes (in map units).
Introduction:
The chromosomes undergo crossing over during meiosis, during which the genetic material from both the parents gets exchanged. During a cross-over a new type of phenotype is formed, representing recombinants that are different from either parent.
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What is a reciprocal cross? Suppose that a gene is found as a wildtype (functional) allele and a recessive mutant (nonfunctional)allele. What would be the expected outcomes of reciprocal crossesif a true-breeding normal individual was crossed to a true-breedingindividual carrying the mutant allele? What would be the results ifthe gene is maternally inherited?
In the clover butterfly, males are always yellow, but females can beyellow or white. In females, white is a dominant allele. Two yellow butterflies were crossed to yield an F1 generation consisting of50% yellow males, 25% yellow females, and 25% white females.Describe how this trait is inherited and specify the genotypes ofthe yellow parents.
But for part A if you cross dd ll x DD LL, won't all the offspring be DdLl (dark colored and long legged), so wouldn't NONE of the offpspring have short legs and light body coloration? Isn't the 9:3:3:1 ratio only for two heterozygous dihybrid crosses? Where is the 25/4 coming from? Could you draw a punnett square to demonstrate.
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Life: The Science of Biology
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