The Y chromosome carries a gene on its sho arm that codes for
Correct Answer: Testes-determining factor (TDF)
Description: The SRY (sex region Y chromosome) gene present on the sho arm of the Y chromosome codes for TDF (Testes Determining Factor). Presence or absence of this chromosome decides whether the fetus will be male or female. Sex determination is not possible till week 6 i.e. why the embryo is called indeterminate embryo till week 6. External sex differentiation completes after week 11. USG sex determination can be done at this time.
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