Biology > DISCUSSION POST > BIOS 256Ch 28 check points week 6 (All)

BIOS 256Ch 28 check points week 6

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1. Describe the principal events of spermatogenesis. Spermatogenesis is the production of sperms from spermatogonia is called spermatogenesis. Spermatogenesis takes 65-75 days. Begins with Spermato ... gonia – Diploid (2n). Stem cells undergo mitosis to replace themselves, and some continue development. Primary spermatocytes – diploid (2n). Each duplicates its DNA, and meiosis begins. a) Meiosis- I: Homologous pairs line up, crossing over occurs. Secondary spermatocytes (haploid-n). Two cells at the end of meiosis-I. Each chromosome made up of 2 chromatids attached at the centromere. b) Meiosis – II: two chromatids separate. c) Spermatids – Four haploid cells at the end of meiosis-II. Cells remain attached to each other by cytopla [Show More]

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