Blood type probability

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Blood type probability

Post by wannabnurse on Sun Apr 26, 2009 2:39 am

In humans, the ABO and Rh are under the control of autosomal genes. If two parents who are both A positive, produce a child who is type O negative, what is the probability their next child will be type O positive?

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Re: Blood type probability

Post by Alla on Mon Apr 27, 2009 12:48 am

Similar to the precious problem, here you have a child that is homozygous recessive for two genes, while parents are heterozygous (because they display different/dominant phenotype).

Once you work that out you get parental genotype AaBb (or any other abbreviations you choose). All you need to do now is a cross AaBb x AaBb and figure out the probability of the O+ve phenotype (genotype aaBb or aaBB).

Good Luck!

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THANK YOU

Post by wannabnurse on Fri May 01, 2009 5:00 am

THANK YOU THANK YOU

You explained this so well, that I did awesome on my test over this!! Thanks for everything.

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