short notes on sex determination in the unborn baby
Answers
The sex of the unborn baby is determined by the sex chromosomes of the father. An egg has two X chromosome while a sperm has a X and a Y chromosome. An egg will always have an X chromosome. Therefore, if the sperm contributes X chromosome then the baby will be a female (XX) and if the sperm contributes the Y chromosome, the baby will be a male (XY). So it is the father, who is responsible for the sex of the baby.
Sex determination is via the chromosomes of the male sperm and the female ovum. There are 23 pairs of chromosomes in each cells. The last pair contains an X chromosome and a Y chromosome in a sperm cell whereas in ovum there are two X chromosomes. If one X chromosome of the ovum fuses with one Y chromosome of the sperm cell, a boy is born. If one X chromosome of the ovum fuses with the X chromosome of the sperm cell, a girl is born. That is how sex of an unborn baby is determined.
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