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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.