Question
A couple have four children whose blood groups are $A, B$ and $A B$. What is the likely combination of the parents’ genotypes?
A. $\quad I^A i$ and $\mathrm{I}^{\mathrm{B}} \mathrm{i}$
B. ||$^A i$ and ||$^B$
C. $\left.\left.\quad\right|^A\right|^B$ and ii
D. $\left.||^A\right|^A$ and $\left|I^B\right|^B$
Answer/Explanation
Ans:A
Question
The pedigree chart shows the inheritance of hemochromatosis, a genetic disease which causes an excessive accumulation of iron in the body.
What can be deduced about this genetic disease from the pedigree chart?
A. It is sex-linked.
B. It is autosomal dominant.
C. It is autosomal co-dominant.
D. It is autosomal recessive.
Answer/Explanation
Ans: D
Question
Huntington’s disease is an autosomal dominant genetic disease. What are the chances of two parents that are heterozygous for the gene having a child with Huntington’s disease?
A. 25%
B. 50%
C. 75%
D. 100%
Answer/Explanation
Ans: C