Set_4B_Dr._Wilson_.MCDB1A.2010

Set_4B_Dr._Wilson_.MCDB1A.2010 - Set 4B Gametogenesis,...

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Unformatted text preview: Set 4B Gametogenesis, Fertilization, Early Development The starting cell is a germ cell (2n), which in males divides by mitosis to form a spermatogonium (still 2n) . This cell then divides by mitosis to form two 2n primary spermatocytes . Next, each primary spermatocyte divides by meiosis I to produce 2 haploid (n) secondary spermatocytes Then the two secondary spermatocytes divide by meiosis II to produce four haploid ( n) spermatids Finally, the 4 spermatids differentiate into 4 mature haploid mature sperm cells ( spermatozoa ) Figure 43.3 Gametogenesis (Part 3) Figure 43.3 Gametogenesis (Part 4) Figure 43.3 Gametogenesis Ch. 44 Opener 2 When Sperm Meet Egg Fertilization Sperm cells: a sperm cell has 3 main parts 1) The head- contains the DNA and a secretory vesicle, called the acrosomal vesicle 2) The neck , or midpiece- contains a mitochondrion that supplies ATP to power the dynein required for microtubule sliding and movement 3) The tail - contains the 9+2 arrangement of microtubules and the motor molecule dynein Sperm Also have bindin Eggs: Important Egg Surface Components Involved in Fertilization (Sea Urchin) Fertilization-initial steps...
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This note was uploaded on 04/09/2011 for the course MCDB 1a taught by Professor Feinstein during the Fall '08 term at UCSB.

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Set_4B_Dr._Wilson_.MCDB1A.2010 - Set 4B Gametogenesis,...

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