Assume that an individual of AB/ab genotype is testcrossed and four classes of testcross progeny are found in equal frequencies.Which of the following statements is TRUE?
A)The genes A and B are on the same chromosome and closely linked.
B)The genes A and B are on the same chromosome and very far apart.
C)The genes A and B are probably between 10 and 20 map units apart on the same chromosome.
D)The genes A and B are likely located on different chromosomes.
E)Either b or d could be correct.

Question

Quizplus · Accepted Answer

When genes A and B produce four classes of testcross progeny in equal frequencies, it indicates either independent assortment (genes on different chromosomes) or that the genes are on the same chromosome but very far apart, allowing for recombination to occur at a high rate, similar to independent assortment. This is why both B and D could be correct, leading to E being the correct choice.

Assume That an Individual of AB/ab Genotype Is Testcrossed and Four