The mechanism by which the sex of an individual is determined is called sex - determination . In human beings, sex of a newborn is genetically determined , whereas in some other it is not. There are 46 (23 pairs) chromosomes in human beings. Out of these 44 (22 pairs) control the body characters and 2 (one pair) are known as sex chromosomes. The sex chromosomes are of two types - X chromosomes and Y chromosomes. At the time of fertilisation , depending upon which type of male gamete fuses with the female gamete , the sex of the newborn child is decided.
What is the statistical probability of getting either a male or a female child ? Justify your answer?