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Title: Inheritance of Blood types : Genotypes Post by: sflaherty99 on Jan 8, 2017 If a woman with the genotype IA, Rh+ and a man with type O, Rh- have a child, what is the probability that the child will have blood type A,Rh-?
Hint: The two blood types are independent events. This is similar to the probability of a child having blue eyes and being a girl. Did you recognize that the answer required this logic? The question could have been written as "What is the probability that the child will be type A and Rh-?" Title: Re: Inheritance of Blood types : Genotypes Post by: bio_man on Jan 9, 2017 I found the answer to this here: More probability (https://biology-forums.com/index.php?topic=57022.msg158460#msg158460)
Please do a better job searching before asking! Title: Re: Inheritance of Blood types : Genotypes Post by: habiba on Jan 9, 2017 The probability that the child will be type A is 0.50. When you say that the woman's genotype is Rh+, that really is not a genotype, but a phenotype. She could be Rh+Rh+ or Rh+Rh-. IF you assume that she is homozygous Rh+Rh+, then the chance of having an Rh- child is 0. If, on the other hand, you assume that she is heterozygous, then the probability of having an Rh- child is 0.5. Combining those two probabilities, (and with making the assumption that she is heterozygous Rh+Rh-), the chance of having a type A Rh- child would be 0.5 X 0.5 = 0.25.
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