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What is PCR

ABO blood gro...

Question

ABO blood groups in humans are controlled by the gene l. It has three alleles-l A, l B and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

A

Two

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B

Three

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C

One

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D

Four

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Solution

The correct option is D
Four

ABO blood group system is an example of multiple alleles but we will inherit only two alleles of a genes. So, the answer is four.

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