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

Fact 2: Genes are arranged in gene clusters.

Given the two facts above, answer the question "How often does a thing arranged in clusters contain instructions for a single protein?" with the following options: 
- PDAs
 - alleles
 - pollen
 - mostly
 - Dilution
 - electron
 - three
 - Flowers


 

    mostly     