A couple comes to you for genetic counselling. Both have a sister affected with albinism but all other members are normal. Your advice regarding the risk of their child being affected with albinism would be:
1. | They must both be heterozygotes so their risk of having an affected child is ¼. |
2. | They might both be heterozygotes so they should get tested to see if they carry the disease allele or not. |
3. | Since neither one of them is affected, they are not at risk of having an affected child. |
4. | You can't give them any firm answers because you don't know their genotypes. |
The inheritance of the trait shown in the given pedigree cannot be a/an:
I. | Autosomal dominant disorder |
II. | Sex-linked dominant disorder |
III. | Holandric disorder |
1. | Only I and II | 2. | Only I and III |
3. | Only II and III | 4. | I, II, and III |
The inheritance of the trait shown in the given pedigree is best explained as a/an:
1. Autosomal dominant disorder
2. Autosomal recessive disorder
3. Sex-linked dominant disorder
4. Sex-linked recessive disorder
On the basis of information given in the pedigree, if II 3 marries a hemophilic man, what is the probability that her first child will be normal?
1. | 1/4 | 2. | 1/2 |
3. | 3/4 | 4. | 0 |
The inheritance pattern of the trait shown in the given pedigree is most likely:
1. | Autosomal recessive | 2. | Sex-linked recessive |
3. | Autosomal dominant | 4. | Sex-linked dominant |
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