19. Ch. 10 Sexual Development.pptx - Sexual Development Development of Sex Organs Gonads Testes Ovaries Internal genitalia External genitalia Gonads

19. Ch. 10 Sexual Development.pptx - Sexual Development...

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Sexual Development
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Development of Sex Organs Gonads Testes Ovaries Internal genitalia External genitalia
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Gonads Develops first Produce ova or sperm Undifferentiated until after about 6 weeks
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SRY Gene Sex-determining Region Y Gene on the Y chromosome Produces a protein that binds to the DNA of cells in undifferentiated gonads and causes them to become testes (testicles) If it is not present, the gonads become ovaries
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Hormonal Effects Organizational effects Influence the development of a person’s sex organs and brain Permanent (once initiated, there is no going back) Activational effect Effects occur later in life, after sex organs have been developed (i.e., induce ovulation) Hormones determine gender
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Müllerian System Default system Does not need hormonal stimulus from the gonads
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Wolffian System Needs hormones from the testes Anti-Müllerian hormone Defeminizing effect Androgens Steroid hormones that stimulate development of the Wolffian system Masculinizing effect
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