Dr._Wilson_Set_8_1A.09

Dr._Wilson_Set_8_1A.09 - Gametogenesis the development of...

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Unformatted text preview: Gametogenesis the development of eggs and sperm- when meiosis occurs Spermatogenesis: Development of Sperm Cells The starting cell is a diploid (2 n) spermatogonium, that divides by mitosis to form another spermatogonium and a primary spermatocyte ( 2 n ) This cell is 2n !! Starting cell Another spermatogonium Spermatogenesis; the Development of Sperm Cells Next, the primary spermatocyte divides by meiosis I to produce 2 secondary haploid (1 n) spermatocytes (1 n) !!! Meiosis I Spermatogenesis; the Development of Sperm Cells Then the two secondary spermatocytes divide by meiosis II to produce four 1 n ( or simply, n) spermatids (1 n) !!! Spermatogenesis; the Development of Sperm Cells Finally, the 4 spermatids differentiate into 4 mature sperm cells (spermatozoa) Oogenesis- Formation of Mature Eggs The starting cell is diploid (2 n) and is called the oogonium . The oogonium frst divides by mitosis to Form two primary oocytes (still, 2 n) (2 n) Large starting cell A second 2 n primary oocyte Oogenesis, Formation of Eggs Next, the primary (2 n) oocyte divides my meiosis I into a secondary oocyte and a rst polar body. The secondary oocyte is 1 n, the rst polar body is also 1 n but does not survive 1 n Oogenesis, Formation of Eggs Next, the secondary oocyte divides by meiosis II into an ootid ( 1 n ) and another 1 n cell destined to die, called the second polar body 1 n Oogenesis, Formation of Eggs Finally, the ootid develops into a mature egg (ovum) 1 n...
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Dr._Wilson_Set_8_1A.09 - Gametogenesis the development of...

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