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Genetics problem involving autosomal recessive allele
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So this problem was on my exam and I'm still having trouble understanding the solution that is provided. I understand why in part A. both the wife's and husband's parents must be heterozygous however I'm lost on part B. I'm confused as to where the the numbers from the P normal girl calculation came from. It looks like it shows two ways on how to do it at the bottom; Is the second equation that is subtracted from one represent affected? If anybody could provide me with the pnormal/paffected equation or explain this problem in full detail including necessary equations that would be extremely helpful. Thank you!

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6 years ago