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Q.

Chromosome number is halved during

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a

Formation of primary spermatocyte

b

Formation of second polar body

c

Formation of first polar body

d

Formation of spermatid

answer is A.

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Detailed Solution

Meiosis I is a reductional division in which chromosome number is halved. It occurs during the formation of first polar body and secondary oocyte in oogenesis. 

Ploidy does not change in meiosis II and mitosis.

  • Formation of second polar body and spermatid - Meiosis II (equational division)
  • Formation of primary spermatocytes - Mitosis
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Chromosome number is halved during