One yeast strain carries the alleles lys+ and arg+, whereas another strain has lys-3 and arg-2. The
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One yeast strain carries the alleles lys+ and arg+, whereas another strain has lys-3 and arg-2. The two strains were crossed to each other, and an ascus obtained from this cross has four spores with the following genotypes: lys+ arg+, lys+ arg-2, lys-3 arg+, and lys-3 arg 2.
This ascus has
a. a parental ditype.
b. a tetratype.
c. a nonparental ditype.
d. either a tetratype or a nonparental ditype.
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To determine the type of ascus produced from the given spore genotypes lets first underst...View the full answer
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