NEET Biology question

Statement 1 (Assertion): The ABO blood-group system provides a good example of multiple alleles. Statement 2 (Reason): In the ABO blood-group system, when and alleles are present together, they both express their own types.

(A)Both assertion and reason are true and reason is the correct explanation of assertion
(B)Both assertion and reason are true but reason is not the correct explanation of assertionCorrect
(C)Assertion is true but reason is false
(D)Both assertion and reason are false

Answer: (B)

Solution

The ABO system is indeed the classic example of multiple allelism, since three alleles (, , ) exist at this single locus in the human population (Statement 1 is true). Statement 2 correctly describes codominance between and (both are true, each independently expressed in the heterozygote) —

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Question ID VK-120433