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  • Write notes on (c) Sex determination in the unborn baby.

8. Write notes on—
    (c) Sex determination in the unborn baby.

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Sex determination of baby-

All humans have 46 chromosomes with 23 pairs. The sex of the unborn child is determined by the process called amniocentesis, in which the amniotic fluid of the foetus is extracted for the test. Out of these, two chromosomes, X & Y are the sex chromosomes. A female has two X and a male has one X and one Y chromosome. The female gamete ovum and male gamete species possess only one set of chromosomes. The unfertilised egg always has one X chromosome, however, sperm can have two different kinds of chromosomes. They can have either an X chromosome or a Y chromosome. When a sperm on the X chromosome of a male fertilises the egg (X chromosome), the zygote has two X chromosomes and develops into a female child. But if the sperm contains a Y chromosome and fertilises with the egg (X chromosomes), the zygote would grow into a male child (XY).

Hence it is clear that the sex of an unborn baby is determined by the father's sex chromosomes.

 

       

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