. Given below is a highly simplified representation of the human sex chromosomes from a karyotype.

 The genes a & b could be of

(a)  colour blindness and body height

(b) attached ear lobe and rhesus blood group

(c)  haemophilia and red-green colour blindness     

(d)  phenylketonuria and haemophhilia



Best Answer

Answer ||| (c)

Solution ||| Haemophilia and reg green colour blindness both are sex linked recessive gene on ‘X’ chromosome.

Body height is an example of polygenic inheritance.

Rhesus blood group is base on the presence or absence of Rh-protein on the surface of RBC, phenylketonuria (PKU) is a recessive autosomal variation.


Talk to Our counsellor