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Pleiotropy

Question

Match the components of List I with List II and choose the correct match. 

 List – I List – II
A)Skin color in ManI)Pleiotropic gene 
B)Flower color in Antirrhinum majusII)Codominance
C)Blood group ABIII)Partial dominance
D)Phenylketonuria IV)Polygenic inheritance

Easy
Solution

Skin color in man is influenced by three different genes represented as A, B and C with each having two allelic forms as Aa, Bb, Cc. Flower color in Antirrhinum is an example for incomplete or partial dominance with homozygous dominant one has red flowers, heterozygous has pink flowers and recessive one white flowers. Blood group AB is an example for Codominance pattern of inheritance as it has antigen A and antigen B on the membrane of RBC of man. Phenylketonuria is an example for single gene mutation influencing more than one phenotypes (pleiotropic gene) such as reduction in hair, mental retardation and reduction in skin pigmentation. 



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