Fact 1: Amutation in the sex cells of a parent can cause a new trait to appear in the parent 's offspring.

Fact 2: Traits are initiated by mutation and recombination.

Given the two facts above, answer the question "what changes sex cells?" with the following options: 
- copying
 - growth
 - clams
 - mutation
 - coded genes
 - transposing
 - hormones
 - cancer


 

    mutation     