04-Sex - Sex Determination non-chromosomal sex...

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Sex Determination non-chromosomal sex determination modes of chromosomal sex determination chromosomal sex determination in human X chromosome inactivation and dosage compensation sex determination in Drosophila
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Non-chromosomal sex determination Temperature dependent sex determination . observed in most snakes and lizards sex is determined by the temperature of incubation during development Sex determination in a Panamanian reef fish . in the blue-headed wrasse, there is only one male in every fish school: the primary male (blue) if this male dies, the largest female becomes a male (her ovaries shrink and testes grow): the terminal male (blue head, yellow/green body) if a new male fish joins a school that already has a male present, the newcomer male becomes a female (yellow)
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Temperature dependent sex determination
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The blue-headed wrasse Females ( yellow ) with the primary male ( blue ) Terminal male ( blue head, yellow/green body )
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Homogametic sex : produces like gametes all gametes produced have an X chromosome females in human and Drosophila (XX) Heterogametic sex : produces unlike gametes produces gametes with an X chromosome and gametes without an X chromosome diploid can be either XY or XO males human and Drosophila (XY) Chromosomal sex determination
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