A male mouse that is heterozygous for a reciprocal translocation between the X chromosome and an autosome

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A male mouse that is heterozygous for a reciprocal translocation between the X chromosome and an autosome is crossed to a female mouse with a normal karyotype. The autosome involved in the translocation carries a gene responsible for coloration of the fur. The allele on the male’s translocated autosome is wild-type, and the allele on its nontranslocated autosome is mutant; however, because the wild-type allele is dominant to the mutant allele, the male’s fur is wild-type (dark in color). The female mouse has light color in her fur because she is homozygous for the mutant allele of the color-determining gene. When the offspring of the cross are examined, all the males have light fur and all the females have patches of light and dark fur. Explainthese peculiar results.

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Principles of Genetics

ISBN: 978-1119142287

7th edition

Authors: D. Peter Snustad, Michael J. Simmons

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