You are presented with the question "Where are mutations found?" and the following answer choices: 
- alleles
 - fossils
 - retina
 - skin
 - embryos
 - ovaries
 - genes
 - eggs

Now knowing that mutations that lead to cancer usually occur in genes that control the cell cycle and mutations in genes that control the cell cycle are found in virtually all cancer cells, choose the best answer.


 

       genes  