Answer Happy

Use the pedigree below to answer questions 17&18. 1 3 5 6 7 8 IV 2 3 3 4 5 6 7 □OO 2 3 4 17. What is the most likely mode of inheritance for this syndrome? Provide three reasons for your answer. [3] 18. If couple III-7 and III-8 have another child, what is the probability that the child will have the syndrome? Show your reasoning. Be sure your answer considers probability for both boys and girls. [4] 2
Use the pedigree below to answer questions 19-21. 10 11 12 13 15 15 19. Is the trait dominant or recessive? How do you know? [2] 20. Is the trait autosomal or sex-linked? How do you know? [2] 14