Consider two hypothetical recessive autosomal genes a and b, where a heterozygote is testcrossed to a double- homozygous mutant. Predict the phenotypic ratios under the following conditions: (a) a and b are located on separate autosomes. (b) a and b are linked on the same autosome but are so far apart that a crossover always occurs between them. (c) a and b are linked on the same autosome but are so close together that a crossover almost never occurs.

Human Heredity: Principles and Issues (MindTap Course List)
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Chapter6: Cytogenetics: Karyotypes And Chromosome Aberrations
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Problem 24QP: A geneticist discovers that a girl with Down syndrome has a Robertsonian translocation involving...
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Consider two hypothetical recessive autosomal genes a and b, where a heterozygote is testcrossed to a double- homozygous mutant. Predict the phenotypic ratios under
the following conditions:
(a) a and b are located on separate autosomes.
(b) a and b are linked on the same autosome but are so far apart that a crossover always occurs between them.
(c) a and b are linked on the same autosome but are so close together that a crossover almost never occurs.

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