question_answer

Crossing over during meiosis occurs at four strand stage. This is proved by the observation that:

A) rarely all four gametes resulting from a meiotic division could be recombinants.

B) usually only two gametes resulting from meiotic division could be recombinants.

C) chaismata are seen only at the four strand stage.

D) occasionally none of the four gametes resulting from meiosis could be a recombinant.