Biology : PU-CET (U.G) 2018 Panjab University Entrance Exam With Answers

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12.

Which Statement Is incorrect ?

A: The Gene Which Controls More Than One Phenotypic Character Is Pleiotropic Gene
B: Inheritance Of Blood Group In Humans Is Polygenic
C: Law Of Segregation Has No Exception
D: Test Cross Is A Cross Of F1 Hybrid With Recessive Parent

The answer is: B

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Explanation

The incorrect statement is B: Inheritance Of Blood Group In Humans Is Polygenic.

The inheritance of blood group in humans is not polygenic but rather it is controlled by multiple alleles of a single gene. Specifically, the ABO blood group system is controlled by three alleles of the ABO gene (IA, IB, and i).