Select from the following. +skin cells +coded genes +sperm and egg fuse +hair cells +the parent's sex cells +lung cells +male gametes +reproduction
Given those answer options, answer the question: Fact 1: Amutation in the sex cells of a parent can cause a new trait to appear in the parent 's offspring. Fact 2: Alleles arise by mutation. Given the two facts above, what can cause new alleles to appear?
A:
the parent's sex cells