In the haploid yeast Saccharomyces cerevisiae, the twomating types are known as MATa and MATα. You cross apurple (ad-) strain of mating type a and a white (ad+)strain of mating type α. If ad- and ad+ are alleles of onegene, and a and α are alleles of an independently inherited gene on a separate chromosome pair, what progenydo you expect to obtain? In what proportions?

Human Heredity: Principles and Issues (MindTap Course List)
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Chapter6: Cytogenetics: Karyotypes And Chromosome Aberrations
Section: Chapter Questions
Problem 16QP: Assume that a meiotic-nondisjunction event causes trisomy 8 in a newborn. If two of the three copies...
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In the haploid yeast Saccharomyces cerevisiae, the two
mating types are known as MATa and MATα. You cross a
purple (ad-) strain of mating type a and a white (ad+)
strain of mating type α. If ad- and ad+ are alleles of one
gene, and a and α are alleles of an independently inherited gene on a separate chromosome pair, what progeny
do you expect to obtain? In what proportions?

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