BIOL 595 11-12-09 (F2009)

BIOL 595 11-12-09 (F2009) - BIOL 595 Sex Determination (I)...

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BIOL 595 11-12-09 Sex Determination (I)
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How is an individual’s sex  determined?
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Removal of Fetal Rabbit Gonads (1953) Results: 1)Female phenotypes 2)Regardless of whether they were XX or XY, they each had oviducts, a uterus and a vagina 3)Each lacked a penis and male accessory structure
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Modern View Individual ‘s sex is determined by…
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Bioethics Figure 5.1 Chromosomal Sex Determination
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Sex Determination 1) Chromosomal Compositions (females; XX, males; XY and  hermaphrodites (XX + XY) 2) Gondal Development (females; ovaries, males; testes and mixed) 3) Endocrine – balance of androgen and estrogen levels in both  male and female 4) Morphological characteristics – body shape and fat depositions Sex is different from gender (feminine, masculine, and neuter)
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Sex Determination 4) Genital Development (females; vagina, males; penis and some  have ambiguous genitals) 5) Gender Identity – sense of self “brain sex” 5) Gender identity – sense of self “brain sex”
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Sex Determination in Mammals 1) Primary sex determination – gonadal  sex (XX or XY) 2) Secondary sex determination – external  phenotype
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BIOL 595 11-12-09 (F2009) - BIOL 595 Sex Determination (I)...

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