CBSE Class 10 Science 2015 Term II Delhi Set 1

Question : 21 of 36

Marks: +1, -0

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 determination of sex of a newborn to justify this statement.

Solution:

There are 23 pairs of chromosomes in human beings, out of these one pair of sex chromosome is there.

Female has one type of chromosome i.e.,

{\X}

and male has two types of chromosomes i.e.,

X

and

Y

. Thus, sex of the child depends on the sex chromosomes of the father.

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