An albino girl gets married to a normal boy, What are . An albino girl gets married to a normal boy, What are
Albinism is an autosomal recessive disorder. If the girl is albino, she must have two recessive alleles (aa). The normal boy could be either homozygous dominant (AA) or a carrier (Aa). But since he's phenotypically normal, he's most likely AA. If the boy is AA, all children would be carriers (Aa) but not affected. If he's Aa, there's a 50% chance for each child to be Aa or aa. However, since the question states the boy is "normal," it's standard to assume he's AA unless stated otherwise. Therefore, all children would be carriers but not have albinism. The correct answer should be 0% chance of being albino, 100% carriers. The options A-D probably include these probabilities. The incorrect options might suggest different chances, like 25% or 50%. I need to explain why those are wrong. Also, the clinical pearl here is that for autosomal recessive disorders, two carriers have a 25% chance of an affected child. But since one parent is affected (aa) and the other is not (AA), the kids can't be affected, only carriers. So the correct answer is that all children are carriers. Now, I'll structure the explanation according to the user's instructions.
**Core Concept**
Albinism is an autosomal recessive disorder caused by mutations in genes responsible for melanin production. For an individual to express albinism, they must inherit two defective alleles (one from each parent). A carrier (heterozygous) has one normal and one defective allele but no clinical symptoms.
**Why the Correct Answer is Right**
The albino girl is homozygous recessive (aa). The normal boy is assumed homozygous dominant (AA) unless stated otherwise. All children will inherit one defective allele (a) from the mother and one normal allele (A) from the father, making them heterozygous carriers (Aa). Since albinism requires two defective alleles (aa), none of the children will be affected, but all will be carriers.
**Why Each Wrong Option is Incorrect**
**Option A:** Suggests 25% of children will be affected—incorrect because albinism only occurs in aa individuals, which is impossible here.
**Option B:** Claims 50% of children will be carriers—incorrect because 100% of children will be carriers (Aa).
**Option C:** States 50% of children will be affected—incorrect for the same reason as Option A.
**Clinical Pearl / High-Yield Fact**
For autosomal recessive disorders, if one parent is affected (aa) and the other is homozygous normal (AA), all children will be carriers (Aa). If the normal parent is a carrier (A