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- May 7, 2011

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a)1/8

b)1/4

c)3/8

d)1/2

Punnet square should have a XX* vs an XY, the "*"referring to the hemophilic gene. The actual answer explanation is that since only 2 of them will be sons, the odds that one of the sons gets it is 1/2, so it's therefore 1/2 * 1/2 * 1/2 to get A. I guessed A b/c it was the smallest, but I reasoned that hte odds of getting a son with hemophilia was 1/4 since you could also get daughters. With questions like these, how do I know to assume that difference? Where the getting the son assumption is 100% (rather than 50%) and getting a son with hemophilia is one of the two sons and not one out of the possible kids?