Question

24. Crossing over takes place in which one of the following during prophase-l of meiosis ?
(A) Diplotene
(B) Pachytene
(C) Leptotene
(D) Diakinesis​

Answer 1

Answer:

b is the answer

hope it helps

Explanation:

Answer 2

Answer:

B) pachytene

Explanation:

Crossing over takes place during the pachytene stage. During this stage, non-sister chromatids of homologous chromosomes may exchange segments over regions of homology. Sex chromosomes, however, are not wholly identical, and only exchange information over a small region of homology. At the sites where exchange happens, chiasmata form. The exchange of information between the non-sister chromatids results in a recombination of information; each chromosome has the complete set of information it had before, and there are no gaps formed as a result of the process. Because the chromosomes cannot be distinguished in the synaptonemal complex, the actual act of crossing over is not perceivable through the microscope, and chiasmata are not visible until the next stage.