Q. Given below is a highly simplified representation of the human sex chromosomes from a karyotype. The gene ‘a’ and ‘b’ could be of
A) Colour blindness and body height
B) Attached ear lobe and rhesus blood group
C) Haemophilia and red–green colourblindness
D) Phenylketonuria and haemophilia
Explanation
Haemophilia and red green colour blindness, both are sex linked recessive gene on ‘X’ chromosome. Body height is an example of polygenic inheritance. Rhesus blood group is based on the presence or absence of Rh-protein on the surface of RBC. Phenylketonuria (PKU) is a recessive autosomal variation.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.