Psy 119 - chapter 5

Psy 119 - chapter 5 - Chapter 5 Biology & Environment...

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Biology &  Environment   Sex & Gender: An Introduction (5 th Edition) Hilary M. Lips Chapter 5 The Process of Becoming  Female or Male
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What Makes an Individual Female or Male? In chapter 5, we ask: What are the biological processes that result in the differentiation of humans into male and female? To what extent do physical sex difference, such as hormonal concentrations, have implications for gendered behavior? What happens when one or more of the biological processes of sexual differentiation is disrupted?
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Chapter 5 Overview continued: What can studies of mixed sex individuals tell us about the link between biology and gender role behavior? What can studies of these individuals tell us about gender identity? What do we know about the reasons for different sexual orientations? Are within-sex variations in hormone levels linked to variations in behavior such as aggression? What Makes an Individual Female or Male?
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Biological Sexual Differentiation Steps in The Process of Human Sexual Differentiation: First, the individual’s sex is genetically determined at conception Then, as the embryo develops, the “indifferent gonad” develops into male or female sex glands. Glands begin secreting male or female hormones Circulating in the bloodstream, the hormones are responsible for the sexual differentiation of other organs: …the internal reproductive tract …the external genitalia …and to a disputed extent, areas of the brain
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Figure 5.1: The 23 pairs of chromosomes in the normal male and female Normal Male Normal Female sex chromosomes are the 23rd pair © 2004 Slide Design by H. Lips & W. Andrew
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Figure 5.2: Three Stages of External Genital Differentiation in the Human Fetus 1 : Sexual appearance of Genital tubercle Genital groove swelling fold Anus baby at second month to third month of pregnancy Female and Male Sexual Differentiation Female and Male Identical © 2004 Slide Design by H. Lips & W. Andrew
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Figure 5.2: Three Stages of External Genital Differentiation in the Human Fetus 1 : Beginning Male Female Genital tubercle (clitoris) Genital tubercle (penis) Vulval groove Urethral groove Inner labial fold Urethral fold Outer labial fold Scrotal swelling Anus Anus Sexual appearance of baby at 3 rd to 4 th month of pregnancy FEMALE MALE Sexual Differentiation © 2004 Slide Design by H. Lips & W. Andrew
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1 From Man and women, boy and girl by John Money and Anke A. Ehrehardt, Baltimore: The Johns Hopkins University Press, 1972, p. 44. © 1972 by the Johns Hopkins University Press. All rights reserved. Reprinted by permission of the publisher. Figure 5.2: Three Stages of External Genital Differentiation in the Human Fetus 1 : At Birth Sexual appearance of baby at time of birth FEMALE MALE Clitoris Penis Lesser (inner) labium Greater (outer) labium Opening of urethra Opening of vagina Urethral raphé (joining line of urethral fold) Scrotum Anus Anus Scrotal raphé (joining line of scrotal swellings) © 2004 Slide Design by H. Lips & W. Andrew
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Step Timing Differentiation Female Chromo -somes
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This note was uploaded on 04/07/2008 for the course PSYCH 119 taught by Professor Ericson during the Fall '06 term at Western Washington.

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Psy 119 - chapter 5 - Chapter 5 Biology & Environment...

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