Psy3_L8 - Biological Basis of Psychology Psychology 3...

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Biological Basis of Psychology Psychology 3 Skirmantas Janusonis Lecture 8 November 16, 2010
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Chapter Ten Sexual Development and Behavior
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Reading Assignment Please use Chapter 10. The review sheets are posted online.
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The Nature and Nurture of Sex Following an accident during a routine circumcision, David Reimer was raised as a girl. At 14, he refused to continue living as a girl, and his parents told him about his medical history. David married and adopted his wife’s children. David comitted suicide in 2004.
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The Genetics of Sex
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Turner’s Syndrome (1 in 2,500 girls) XO genotype (O = chromosome absent) Female external genitalia Fertility may be affected by abnormal ovaries Normal intelligence, with some spatial and memory deficits Short stature (average 4’8’’)
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Klinefelter’s Syndrome (1 in 1,000 boys) XXY genotype Male external genitalia Reduced fertility May require hormonal treatment at puberty to promote the development of secondary male sex characteristics Normal intelligence, with some verbal cognitive difficulties
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The “Super Male” (1 in 1,000 boys) XYY genotype Male external genitalia Fertile, but higher likelihood of producing abnormal sperm Intelligence is slightly below that of XY males May correlate with higher rates of antisocial and criminal behavior, but this is more likely due to lower intelligence Tall, lean, with some subtle physical abnormalities
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Stages of Prenatal Development Development of gonads . Development of internal organs . Development of external genitalia . Development at puberty . Normally, all four processes do not contradict each other to produce an unambiguous male or female.
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Step 1: The Development of Gonads Up until 6 weeks after conception, both male and female fetuses have undifferentiated primordial gonads . MALE SRY GENE:
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Psy3_L8 - Biological Basis of Psychology Psychology 3...

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