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Set_4B_Dr._Wilson_.MCDB1A.2010

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

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Set 4B Gametogenesis, Fertilization, Early Development
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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 .
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Next, each primary spermatocyte divides by meiosis I to produce 2 haploid (n) secondary spermatocytes
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Then the two secondary spermatocytes divide by meiosis II to produce four haploid ( n) spermatids
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Finally, the 4 spermatids differentiate into 4 mature haploid mature sperm cells ( spermatozoa )
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Figure 43.3 Gametogenesis (Part 3)
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Figure 43.3 Gametogenesis (Part 4)
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Figure 43.3 Gametogenesis
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Ch. 44 Opener 2 When Sperm Meet Egg Fertilization
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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
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Sperm Also have “bindin”
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Eggs: Important Egg Surface Components Involved in Fertilization (Sea Urchin)
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