Question

Having an extra finger is rare, but controlled by a dominant gene. If a

normal parent and a heterozygote parent have a child, what is the
probability that they will have a child with an extra finger?

Answer 1

if the child was meant to be a twin but then if the twins got mixed up with each other, the one that's

lucky to come out will have part of the other.

and if the other twin doesn't come out great the other either has to have a second head, 6th finger, etc. ...

Answer 2

The answer to this question is 50%.