150-JP5(L3,17)

150-JP5(L3,17) - BISC 150 Petruska Lecture 5...

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Unformatted text preview: BISC 150 Petruska Lecture 5 150-JP5(L3,17).ppt Part 1 Review JP4(L3).ppt slides 16-20 on Human (and Sexual) Development References: Lewis, Human Genetics (8th Ed. 2008), Chaps. 3, (6) Fertlilization by a sperm cell induces secondary oocyte (arrested in metaphase II) to complete meiosis. The sperms acrosome bursts, releasing enzymes that enable the sperms nucleus to enter the oocyte. A series of chemical reactions prevents other sperm from entering. Fig. 6.1 Male or Female? Paired duct systems in the early human embryo may develop into male or female sex organs. The red tubes represent female structures and the blue tubes, male structures. Male sex organ development requires presence of SRY gene (on Y chromosome). Activation of SRY starts a cascade of gene action that causes the undifferentiated gonad to develop into testis. Then some cells in testis secrete hormone that causes Mullerian (red) duct to disintegrate....
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This note was uploaded on 04/27/2010 for the course BISC 150 at USC.

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150-JP5(L3,17) - BISC 150 Petruska Lecture 5...

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