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4.Principles of Inheritance and Variation
medium
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
Solution
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.
Standard 12
Biology
