Following a series of two-point testcrosses in Neurospora, 200 tetrads were analyzed. Of these, 100 were PD and 100 were NPD. These two genes are
A) 50 map units apart on the same chromosome.
B) 100 map units apart on the same chromosome.
C) epistatic.
D) on different chromosomes.
E) adjacent to each other on the same chromosome.

Question

Quizplus · Accepted Answer

The equal number of parental ditype (PD) and non-parental ditype (NPD) tetrads suggests that the genes are on different chromosomes, as this ratio is expected when genes assort independently.

Following a Series of Two-Point Testcrosses in Neurospora, 200 Tetrads