Question

Destiny has distal symphalangism - her fingers and toes are stiff, with tiny nails. she looks it up and finds it is an autosomal dominant trait. since her parents do not have it, she reasons that she is a new mutation. however, if she has children, each of them, assuming her partner does not have the condition, has a(n) ___ probability of inheriting the condition.

Answer 1

An autosomal disorder can be caused by a single abnormal gene on one of the first 22 nonsex chromosomes of either parent. So a parent with an autosomal dominant condition (as is the case with Destiny) has a 50% chance of passing that condition to a child.

This number remains the same for each subsequent pregnancy.