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Q: Genetic Formula ( Answered ,   1 Comment )
 Question
 Subject: Genetic Formula Category: Science > Biology Asked by: jennifer1000-ga List Price: \$2.00 Posted: 06 Oct 2004 12:05 PDT Expires: 05 Nov 2004 11:05 PST Question ID: 411137
 ```A colorblind man that has type AB blood marries a woman that can pick out his ties for him no matter how colorful they are, even through her dad was colorblind. His spouse is heterozygous for type B blood. If they decided to spend over \$250,000 and have a curtain climber, what would be the chances of them having a son that would be colorblind and also have type A blood?```
 Answer
 Subject: Re: Genetic Formula Answered By: librariankt-ga on 07 Oct 2004 07:20 PDT Rated:
 ```Hi Jennifer, The tricky part of this question is that colorblindness (red-green) is recessive on the X chromosome, making it sex linked. See this page for a discussion of the genetcs: http://www.biology.arizona.edu/human_bio/problem_sets/color_blindness/color_blindness.html. I'm calling our colorblind gene C and c, with the Y chromosome not having either of them so noted just as Y. Here are our parents' genetics: Man: ABcY Woman: BOCc (she is heterozygous because her father, who was cY, gave her his colorblind X gene, but she's not colorblind so her other X must have the dominant C) In this case, since we have three different options for each gene (A,B,O for blood; C, c, Y for colorblindedness), there are sixteen different possible outcomes - which distinguishes us from our previous questions. Usually you'll have two possible ways to get a heterozygous child - but in this case each possible combination has a 1/16th chance of showing up. I.e., you have 1/16th chance of having a colorblind boy with type A blood. If it helps, you have 1/2 chance of getting a boy. There are four blood types possible (AB, BB, BO, and AO), so you have a 1/4th chance of type A blood. Half of your boys will be colorblind. Multiple the probabilities: 1/2 times 1/4 times 1/2, and you get a 1/16th chance of boy - AO - colorblind. Librariankt```
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 Subject: Re: Genetic Formula From: netbuster-ga on 06 Oct 2004 12:34 PDT
 `50 %`
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