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Q.

Chromosome number is halved during

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a

Formation of first polar body

b

Formation of second polar body

c

Formation of spermatid

d

Formation of primary spermatocyte

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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