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Lecture 15

Lecture 15 - Sex, Gender and the Brain

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University of Toronto St. George
Human Biology
John Yeomans

HMB200H1S L15 March 06 2012 Sex Gender and the BrainSex and GenderWhat is malefemaleBiological defn Large gametefemale ovum o Female reproductive egg determines sex o Until females reproductively active then possible to determine sex within species within ecosystemChromosomes XX female XY male o XO XXY XYYo Ymale o Dif ratiosdif odd casesGenitalia Internalexternal o Primary sex characteristics which doctors look at to find sex of baby o External genitalia can be misleading so have to analyze chromosomesPrimarysecondary sex characteristics o External genitalia become smaller in body percentage after birth because surge of hormones decreases after birthHormones androgensestrogensBrain changesGender identity o Whether you are male or femaledetermined by social factorsinternal biologyBhvrssocial identity o Ex Partner preferences If have SRY gonads shift from undifferentiated to male 6wks after o Hypothal projects to dif parts of limbic system by ascending gestation shrinkage of female structures pathwaysUnisexual until 15wks of gestationSexual Differentiation how primary sex characteristics are produced1535wks huge amt of changes in external genitalia o Removal of genitalia do
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