1.

Sex is determined in human beingsA. by ovumB. at the time of fertilisationC. 40 days after fertilisationD. seventh to eight week when genitals differentiate in foetus

Answer» Correct Answer - B
In human beings male produces two types of sperms. 50% of them carry X-chromosome and 50% have Y-chromosome.
Sex in human beings is determined at the time of fertilisation because sex of baby depends upon which sperm fertilises the ovum.


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