. How many pairs of chromosomes are present in human beings
Out of these how many are sex chromosomes? How many types of sex chromosomes are found in human beings? "The sex of a newborn child is a matter of chance and none of the parents may be considered responsible for it". Draw a flow chart showing determ nation of sex of a newborn to justify this statement.
Ans. • There are 23 pairs of .chromosomes present in human beings.
• There is 1 pair of sex chromosomes present in human beings.
• The chromosomes which determine the sex of a person are called sex chromosomes. There are two types of sex chromosomes, one is called X chromosome and the other is called Y chromoso e. Males contain one X chromosome and one Y chromosome (XY), while females contain two X chromosomes (XX).
• Flow chart showing determination of sex of a child.