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  • Assertion: During the pachytene stage, non-sister chromatids of homologous chromosomes exchange places at the recombination nodules.  Rea

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.

Option: 1

A


Option: 2

B


Option: 3

C


Option: 4

D


Answers (1)

best_answer

 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. 

Posted by

Pankaj Sanodiya

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