ZoologySex of the human baby is determined at the time of 

Sex of the human baby is determined at the time of 

  1. A

    Fertilisation based on the sex chromosome of the fertilizing ovum

  2. B

    Fertilisation based on the sex chromosome of the fertilizing sperm

  3. C

    Implantation based on the sex chromosome of the ovum

  4. D

    Gametogenesis based on the sex chromosome of the fertilizing sperm

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    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.

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