A Random Base Change Is Less Likely to Affect Phenotype

Multiple Choice

A random base change is less likely to affect phenotype in humans than in bacteria. Why? Please select all that apply.

A) Humans have two copies of a gene whereas bacteria have one copy.
B) A higher percentage of the human genome consists of genes than the bacterial genome.
C) Less of the human genome is functional than the bacterial genome.
D) A third base change is more likely to occur in bacteria than in humans.