Assertion: During the pachytene stage, non-sister chromatids of homologous chromosomes exchange places at the recombination nodules.
Reason: This explains why the chromosomes are still joined at the points of crossing across.
A
B
C
D
Both assertion and reason are true and reason is the correct explanation of assertion.
Compared to the mitotic prophase, prophase I, the first phase of meiosis I, is the longest phase. It is further divided into five substages, including
leptotene.
zygotene
Diakinesis
pachytene
diplotene
The chromosomes begin to condense and take on a compact form during leptotene. During the pachytene stage, non-sister chromatids of homologous chromosomes exchange places at the recombination nodules. The chromosomes are still joined at the points where they cross over.
Option 1 is the correct answer.