Sexual Differentiation - Anatomy & Physiology

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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

External Genetalia

Turner's Syndrome
Kleinfelter's Syndrome
Testicular Feminisation
Adrenogenital Syndrome
Bovine Freemartinism
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