Kat has prematurely white hair (her hair turned white when she was just 22 years

Question

Kat has prematurely white hair (her hair turned white when she was just 22 years old). Her father same condition but her brother, brown hair and is now 42 years old. Interestingly, Janice's oldest daughter, Jordon, just turned 14 and her hair has turned white. This pattern of inheritance is consistent with: A. Incomplete penetrance B. Codominance C. Multiple allelism D. Variably expressivity E. Both a and d Five enzymes are required to make vitamin B6. Mickey ishomozygous for a null mutation in the gene that codes for the third enzyme in the pathway. Which of the following could be used to supplement Mickey's diet so that he can make vitamin B6 on his own? A. Intermediates 1, 2, or vitamin B6 B. Intermediates 1, 2, 3, or vitamin B6 C. intermediates 4, 5, or Vitamin B6 D. intermediates 3, 4, 5, or vitamin B6 E. Vitamin B6 only

Explanation / Answer

7. Option A. Incomplete penetrance

As the signs and symptoms are the same, but the time of onset differs a lot.

8. Option D. Intermediates 3,4,5 or Vitamin B6

As none of them require the third enzyme for further processing.

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