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if two parents whose blood types are both B produce a child that has blood type O, what can you say about the parents genotype?

User Tim Kozak
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Both parents would have to be heterozygous. Their genotypes would be either BO and BO, or IBi and IBi.
(Each parent has one B allele, and one O or 'no antigen' allele.)
User Fvisticot
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