Sex of the human baby is determined at the time of
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a
Fertilisation based on the sex chromosome of the fertilizing ovum
b
Fertilisation based on the sex chromosome of the fertilizing sperm
c
Implantation based on the sex chromosome of the ovum
d
Gametogenesis based on the sex chromosome of the fertilizing sperm
answer is B.
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Detailed Solution
All the haploid gametes (ova) produced by the female have the sex chromosome X whereas in the male gametes (sperms) the sex chromosome could be either X or Y. So, sex of the human baby is determined at the time of fertilisation based on the sex chromosome of the fertilizing sperm.