Open Question
A man with type B blood and a woman who has type A blood could have children of which of the following phenotypes?a. A or B onlyb. AB onlyc. AB or Od. A, B, AB, or O
13. Mendelian Genetics
Incomplete Dominance vs. Codominance
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Which of the following matings cannot produce a child with blood type O? The letters refer to blood types (phenotypes).
A
A × A
B
A × B
C
O × O
D
None of the listed responses is correct.
E
O × AB
Verified step by step guidance1
Understand that blood type is determined by alleles: A, B, and O. The O allele is recessive, while A and B are co-dominant.
For a child to have blood type O, they must inherit an O allele from each parent, resulting in the genotype OO.
Consider the possible genotypes for each parent based on their phenotypes: A can be AA or AO, B can be BB or BO, O is OO, and AB is AB.
Analyze each mating pair: A × A can produce AO or OO offspring if both parents are AO. A × B can produce AO, BO, AB, or OO offspring if one parent is AO and the other is BO. O × O can only produce OO offspring.
For the mating O × AB, the possible offspring genotypes are AO and BO, as the O parent can only contribute an O allele and the AB parent can contribute either an A or a B allele. Therefore, this pairing cannot produce a child with blood type O.
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