Hemophilia is a sex-linked RECESSIVE disease. If you made a Punnett square from the parents shown above, what percent of the offspring have hemophilia? (Make the Punnett square, then mark each individual that will express the recessive h. Each square will represent 25%.) 25%

50%

75%

100%

The possible genotypes are: XHXh, XHY, xhxh, xhY

So the percent of offspring who will have emophilia is 50%

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