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

Fact 2: Sex chromosomes determine gender.

Given the two facts above, answer the question "The determination of what is coiled structures made of DNA and proteins?" with the following options: 
- PDAs
 - ligt
 - complex
 - gender
 - improve
 - SO2
 - three
 - alleles


 

    gender     