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Sexual Differentiation - Anatomy & Physiology (view source)
Revision as of 09:14, 3 July 2008
, 09:14, 3 July 2008→Genetic Sex
== Genetic Sex ==
== Genetic Sex ==
* Established at the time of '''fertilisation'''.
* The foetus receives its genetic endowment in two equal portions from the male gamete ('''Spermatozoon''') and female gamete ('''Oocyte''').
* The X sex chromasome is larger than the Y sex chromasome.
* '''Females''' have XX chromasomes. All oocytes contain one X chromasome, they are the '''homogametic''' sex.
* '''Males''' have XY chromasomes. Spermatozoa form two distinct populations, one containing X chromasomes and one containing Y chromasomes. They are the '''heterogametic''' sex.
== Internal Genetalia ==
== Internal Genetalia ==