WAEC BIOLOGY 2002 : A man with heterozygous genotype for blood group B marries a woman with heterozygous A, what percentage (%) of their children would be universal donor?

A man with heterozygous genotype for blood group B marries a woman with heterozygous A, what percentage (%) of their children would be universal donor?
A. 50%
B 25%
C. 15%
D. 10%
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