Fact 1: Mutations that lead to cancer usually occur in genes that control the cell cycle.

Fact 2: Mutations in genes that control the cell cycle are found in virtually all cancer cells.

Given the two facts above, answer the question "Where are mutations found?" with the following options: 
- alleles
 - fossils
 - retina
 - skin
 - embryos
 - ovaries
 - genes
 - eggs


 

       genes  