Production and Division of Sperm

Production and Division of Sperm - Production and Division...

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Production and Division of Sperm Mitotic and Meiotic events – spermatogenesis - Primordial germ cells differentiate into early germ cells – in males, spermatogonia - Majority of spermatogonia are A 1 – can reproduce mitotically to make more A 1 or change their fate and become Type A 2 spermatogonia. Type A 2 can only divide mitotically to make Type A 3 , which divides mitotically to make A 4 , which can divide mitotically to produce Intermediate spermatogonia, which can divide to form Type B. - All of these spermatogonia have cytoplasmic bridges connecting them - Fig 19.6 – will have to draw a list one branch to show that you go through a series of steps. Spermatogenesis –continued - Primary spermatocytes – diploid cell (2N), first cells that can divide meiotically - Secondary spermatocytes – haploid, even though they may contain two copies of a gene (not homologous genes), divide 2 nd meiosis division - Spermatids – haploid, single DNA copy, goes through differentiation to make
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