If an individual who is homozygous for type B blood marries a heterozygous type A individual, what is the chance that their first child will have type AB blood?

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The homozygous type B individual has genotype BB and can only pass on the B allele. The heterozygous type A individual has genotype AO and can pass on the A or O allele. The possible genotypes of their offspring are AB, AO, BO, and OO. Since the type A individual is heterozygous, there is a 50% chance that the A allele will be passed on. The type B individual will always pass on the B allele. Therefore, the chance of their offspring having AB blood type is 50%.

If an Individual Who Is Homozygous for Type B Blood