(D) Myotonic dystrophy is an $Autosomal \text{ Dominant}$ genetic disorder, which is caused by a mutation in a dominant gene. Therefore, Assertion $(A

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Both Assertion and Reason are incorrect.

(D) Myotonic dystrophy is an $Autosomal \text{ Dominant}$ genetic disorder, which is caused by a mutation in a dominant gene. Therefore, Assertion $(A)$ is incorrect.The excessive synthesis of fibrillin protein mentioned in $R$ is related to Marfan syndrome, not myotonic dystrophy. Therefore, Reason $(R)$ is also incorrect.

Class 12 Biology Principles of Inheritance and Variation Pleiotropy

Medium

$A$ : Myotonic dystrophy is caused by a recessive mutant pleiotropic gene.
$R$ : Gene mutation leads to more synthesis of fibrillin proteins.

A
Assertion and Reason both are correct and Reason is the correct explanation of Assertion.
B
Assertion and Reason both are correct but Reason is not the correct explanation of Assertion.
C
Assertion is correct, but Reason is incorrect.
D
Both Assertion and Reason are incorrect.