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How is sex determined in human beings?

Asked by Topperlearning User 26th November 2013, 12:50 AM
Answered by Expert

The females carry two X-chromosomes. Females produce one type of gametes (eggs) with same type of chromosomes (22 + X). Males have one X and one Y chromosome. Among the male gametes, half of the sperms carry X-chromosome (22 + X) and half carry Y-chromosome (22 + Y). Thus female is homogametic and male is heterogametic.

When a sperm carrying X chromosome fertilizes an egg, the zygote develops into female (XX condition). When sperm carrying Y chromosome fertilizes an egg, the zygote develops into a male (XY condition). Thus, sex is determined at the time of fertilization.

Answered by Expert 26th November 2013, 2:50 AM
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