At what stage of the meiotic cell cycle and during what chromosomal configuration does crossing over occur?
A)during synapsis in prometaphase
B)at the four-strand stage of meiosis,after synapsis of homologous chromosomes,and before the end of prophase I
C)in S phase of meiosis
D)during synapsis at the four-strand stage of meiosis
E)during bivalent formation,after synapsis of homologous chromosomes,and before the end of prophase I

Question

Quizplus · Accepted Answer

Crossing over occurs at the four-strand stage of meiosis, after synapsis of homologous chromosomes and before the end of prophase I. This is when homologous chromosomes exchange genetic material.

At What Stage of the Meiotic Cell Cycle and During