Hi, I am quite confused how to solve question 25 - 27. Please help! Thanks! Auto

Question

Hi, I am quite confused how to solve question 25 - 27.
Please help!
Thanks! Auto, Rec Pedigree #7 ela 25. If the trait concerned in pedigree #7 is caused by an autosomal recessive gene, what is the probability that any child from the couple indicated by the arrows will be affected? (Assume the 1st generation couple in the middle are both homozygous) a) zero b) 1/4 c) 1/8 d) 1/16 26. If the trait concerned in pedigree #7 is caused by a sex-linked dominant gene, what is the probability that the couple indicated by the arrows will have an affected child? (They will have only one child.) a) 1/4 b) zero c) 1/2 for males; zero for females d) Probability cannot be determined from this pedigree. 27. If the trait concerned in pedigree #7 is caused by an autosomal dominant gene, what is the probability that the couple indicated by the arrows will have an affected child? (They will have only one child.) a) 1/4 b) zero c) 1/2 for males; zero for females d) Probability cannot be determined from this pedigree.

Explanation / Answer

25)-option a is correct because recessive gene caused the disease.

26)-option a is correct because if disease causes by sex linked dominant gene then there is chances that the child affected by disease.

27)-option a is correct because there is chances that the child affected by disease.

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