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

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Unformatted text preview: 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 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) Temperature dependent sex determination The blue-headed wrasse Females ( yellow ) with the primary male ( blue ) Terminal male ( blue head, yellow/green body ) 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 The...
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This note was uploaded on 11/13/2009 for the course PCB 3063 taught by Professor Sotero during the Fall '09 term at University of Central Florida.

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

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