Q.

In humans, sex of a baby is determined by which of the following?

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a

At the time of fertilisation and by genotype of mother

b

At the time of delivery and by the newborn

c

At the time of fertilisation and by genotype of father

d

At the time of fertilisation and by the genotype of both father and mother

answer is C.

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Detailed Solution

  • Male gametes have XY sex chromosomes and female gametes have XX sex chromosomes. There is a 50% chance of an infant being a girl or a boy.
  • At the time of fertilisation and by the genotype of the father sex of a baby can be determined.
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