Fact 1: Most genes contain the instructions for a single protein.

Fact 2: Alleles are alternative forms of a gene.

Given the two facts above, answer the question "Alternative instructions for a single protein are encoded on:" with the following options: 
- alleles
 - Acids
 - PDAs
 - nucleus
 - junk DNA
 - A computer
 - inheritance
 - Tail


 

 alleles        