Aassertion : In humans , most sex-lineked genes are present on the X chromosome.
Reason : Human chromosome contains a large number of genes with major effects on phenotype.

Options

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If both the assertion and reason are false

Answer

A

Explanation

There are about 1,098 human X – linked genes. Most of them code for something other than female anatomical traits. It contains a large number of genes which show major phenotypic effect. Ex: Baldness is also responsible because of X – linked genes.