For two statements are given- one labelled Assertion (A) and the … - Vidyadip

MCQ

For two statements are given$-$ one labelled
Assertion $(A)$ and the other labelled
Reason $(R)$. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below:
Assertion: If blood group of both mother and father is $'O'$ then the blood group of children will also be $O .$
Reason: Blood group in humans is determined by many alleles of a gene viz. $1^{ A }, 1^{ B }, 1^{ D }$.

A
Both $A$ and $R$ are true, and $R$ is correct explanation of the assertion.
✓
Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.
C
$A$ is true, but $R$ is false.
D
$A$ is false, but $R$ is true.

✓

Answer

Correct option: B.

Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.

The blood group system in humans is determined by a gene which has 3 different alleles viz. $I^A, I^B$ and $I^O. I^A$ and $I^B$ are dominant to $I^O$ but codominant to each other. Blood group A is indicated by genotype $I^A, I^A or I^A I^O,$ Blood group $B \rightarrow I^B I^B$ or $I^B I^O$, Blood group $A^B \rightarrow I^AI^B$ and blood group $O \rightarrow I^O I^O$

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