In unordered tetrad analyses of two linked loci,a nonparental ditype is an indication of:
A)no crossovers.
B)single crossover.
C)two chromatid double crossover.
D)three chromatid double crossover.
E)four chromatid double crossover.

Question

Quizplus · Accepted Answer

A nonparental ditype (NPD) in unordered tetrad analysis indicates a four chromatid double crossover, as it results in all four chromatids being involved, producing two recombinant and two non-recombinant chromatids.

In Unordered Tetrad Analyses of Two Linked Loci,a Nonparental Ditype