Fact 1: Chromosomes are coiled structures made of DNA and proteins.

Fact 2: An egg or sperm with an extra chromosome or missing a chromosome is then made.

Given the two facts above, answer the question "What are one thing the combination of proteins and DNA make up?" with the following options: 
- alleles
 - sperm
 - insects
 - embryos
 - fusion
 - PDAs
 - humans
 - complex


 

  sperm       