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.
HINT: This problem involves an understanding of linkage, crossing over, and independent assortment. The key to its solution is to be aware that results are indistinguishable when two genes are unlinked compared to the case where they are linked but so far apart that crossing over always intervenes between them during meiosis.
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