PSYC 211 Lecture Notes - Lecture 13: Sex Steroid, Neural Pathway, Pair Bond

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Sexual dimorphic behaviours - behaviour that has different forms (or that occurs with different probabilities or under different circumstances) in males and females. 46 chromosomes: through sexual production, a person either has xx or xy in dna. In humans, biological sex is determined by five factors present at birth: sex chromosomes: xx or xy, gonads: testes or ovaries, sex hormones: androgen signaling, external anatomy. If you do not have 2 x chromosomes, you will not have ovaries: the m llerian s ys tem will develop into internal female s ex org ans. Internal female sex organs develop in the absence of anti-m llerian hormone. If the ovaries don"t do anything until puberty, what triggers development of female sex organs: the absence of hormone signaling. It triggers development of male external sex organs. These hormones also have effects on brain anatomy which will influence behaviour.

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