Question

The Smith family is afflicted with a genetic disorder known as Pinocchio nose syndrome, which causes affected adults to grow noses in excess of five inches long. 100 members of the Smith family show up for a family reunion. Of the fifty-three women, thirty-seven have unusually large noses. Of the forty-seven men, thirty-six have an enormous nose. Based on these figures, Pinocchio nose syndrome is probably
A) dominant and sex-linked.
B) recessive and sex-linked.
C) dominant, but not sex-linked.
D) recessive, but not sex-linked.

Answer 1

Answer:

C- Dominant, but not sex-linked

Explanation:

The disorder is not sex-linked because almost equal numbers of people have Pinocchio nose syndrome. If the disorder was sex linked you would have way more men than women having the disorder.

You can tell that the genetic disorder is dominant because there is a 3:1 ratio for those who have the disorder.

36 out of 47 men ≈0.765

37 out of 53 women≈0.69

These numbers approximate a 3:1 ratio (even if it's not exact), meaning that the disorder is most likely dominant

Answer 2

the answer is actually D. not sex-linked but unable to tell if it is dominant or recessive