A haploid yeast strain has mating type a and genotype his4 TRP1. A different haploid yeast strain has mating type ? and genotype HIS4 trp1. The two strains mate and produce diploid offspring with genotype his4 TRP1 / HIS4 trp1. The diploid cells undergo meiosis to produce a variety of tetrad types. In the following questions, the genotypes of the spores in a tetrad are shown. For each tetrad, tell what type it is: parental (PD), non-parental (NPD), or tetratype (T).
-HIS4 trp1; HIS4 trp1; his4 TRP1; his4 TRP1
A)PD
B)NPD
C)T
D)cannot be determined

Question

Quizplus · Accepted Answer

This tetrad is considered parental (PD) because all the spores have the same genotype as the original parental strains, indicating that no recombination between the HIS4 and trp1 loci has occurred during meiosis.

A Haploid Yeast Strain Has Mating Type a and Genotype