Question

a young couple has been arguing about their son who has O blood type, meanwhile they are having A and B blood type. what might explain this outcome?
A. the husband is homozygotic B and his wife is heterozygotic A
B. The husband is heterozygotic A and his wife is heterozygotic B
C. the husband is heterozygotic B and his wife is homozygotic A
D. the husband is heterozygotic B and his wife is heterozygotic A
E. both of B and D are correct

Answer 1

Answer to the questions #43280, Biology, Other

A young couple has been arguing about their son who has O blood type, meanwhile they are having A and B blood type. What might explain this outcome?

A. the husband is homozygotic B and his wife is heterozygotic A

B. The husband is heterozygotic A and his wife is heterozygotic B

C. the husband is heterozygotic B and his wife is homozygotic A

D. the husband is heterozygotic B and his wife is heterozygotic A

E. both of B and D are correct

Answer: The correct answer is E

Homozygotic son (OO) could be born in families B and D with the probability $\frac{1}{4}$ (probability to get allele O from both parents is $\frac{1}{2}$, thus probability of the zygote (genotype and phenotype in the case of co-dominance) is a product of the probabilities of both gametes ($\frac{1}{2} \times \frac{1}{2}$). As these traits are not sex-linked it does not matter which parent has A or B allele. Thus, both cases are equiprobable.

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