QUESTION 10 1 points Save Answe Which of the above are examples of incomplete pe

Question

QUESTION 10 1 points Save Answe Which of the above are examples of incomplete penetrance? O a. Some women with a mutant BRCA1 allele develop breast cancer, but others do not. O b. Some people with Marfan's syndrome have only mild symptoms (such as being tall and thin with long, slender fingers), while others also experience life-threatening complications involving the heart and blood vessels C. A father with blood type A and a mother with blood type B can have a child with blood type O O d. For some plant species, a cross between a true-breeding individual with red flowers and a true-breeding individual with white flowers produces progeny that have pink flowers. O e. Two of the above are examples of incomplete penetrance.

Explanation / Answer

10. Autosomal dominant condition showing incomplete penetrance is familial breast cancer due to mutations in the BRCA1 gene.female with amutation in this gene have an 80% life time risk of developing breast cancer

So the correct answer is : a

11. XYY incidence of XYY syndrome is approximately 1 in 800-1000 male births many cases remain undiagnosed because of their normal appearence and fertility and th absence of severe symptoms. The extra Y chromosome is usually a result of non-disjunction during petarnal meiosis II

So the correct answer is : b

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