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Sexual Differentiation PowerPoint Presentation

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Sexual Differentiation Presentation Transcript

Slide 1 - Adventures in Biology... Last Week in…. We discussed the different forms of Reproduction We discussed the costs/benefits of each form This week we’ll discuss sexual differentiation - how sexually reproducing organisms develop into separate sexes. Specifically, as it applies to us humans
Slide 2 - SO…How Do We Get From… Here… To here… To here… OR ? (essentially a clump of undifferentiated cells) (fully developed adult female) (fully developed adult male)
Slide 3 - In other words, How do our bodies know if we are meant to use the little boys’ room or the little girls’ room? It’s the factor!
Slide 4 - The Y chromosome contains a gene known as the SRY (sex determining region on the Y chromosome) gene. This gene is responsible for the development of testes But what about the factor?
Slide 5 - Everyone develops an area known as the urogenital ridge Unless testes develop, this area will naturally develop into the female reproductive system In other words, we are all female by default
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Slide 8 - BUT…how does this happen?? When testes form they release 2 hormones - testosterone & MIS (mullerian inhibiting substance) The testosterone causes the male reproductive system to develop MIS causes the ducts of the female system to degenerate
Slide 9 - Testosterone & MIS Leads to development of mature male reproductive system testes SRY gene on the Y Chromosome
Slide 10 - leads to the natural development of the Female reproductive organs produces Estrogen & Progesterone leads to development of mature female reproductive system
Slide 11 - This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.