. 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.     

Best Answer

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.


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