In tetrad analysis, NPD asci can result from (Select all that apply. )
A)independent assortment of unlinked genes.
B)double crossovers between linked genes.
C)single crossovers between linked genes.
D)single crossovers between a gene and a centromere.

Question

Quizplus · Accepted Answer

NPD (non-parental ditype) asci can result from independent assortment of unlinked genes (A) because unlinked genes segregate independently, leading to equal probabilities of parental and non-parental combinations. NPD asci can also result from double crossovers between linked genes (B) because double crossovers can restore the parental combination in two of the spores while creating non-parental combinations in the other two, resulting in an NPD ascus if the crossover events are between the genes being analyzed and their centromeres.

In Tetrad Analysis, NPD Asci Can Result from (Select All