Dupuytren’s is a disorder that affects the hands. The diagram below shows the inheritance of Dupuytren’s in one family Person 7 and person 8 in the diagram above are expecting a fourth child. What is the probability of the child having Dupuytren’s? You should: • draw a Punnett square diagram • identify which offspring have Dupuytren’s – 7000

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1. Person B gametes: d, d

   Offspring genotypes: Dd, Dd, dd, dd

   Offspring with Dupuytren’s: Dd, Dd

   Probability: 50%

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