Some of the olfactory receptor (OR)genes in humans
A)have mutated dramatically away from the same genes in other primates.
B)have been inactivated,reducing our olfactory capabilities compared to other primates.
C)have been activated,enhancing our olfactory sense compared to other primates.
D)have duplicated more frequently,resulting in increased paralogs compared to other primates.
E)have been conserved more rigidly,resulting in increased orthologs compared to other primates.

Question

Quizplus · Accepted Answer

Studies have shown that many OR genes in humans have been inactivated, resulting in a reduction of olfactory capabilities compared to other primates. This is thought to be due to a shift in reliance towards other senses such as vision and hearing, as humans evolved to become more dependent on social and cultural cues.

Some of the Olfactory Receptor (OR)genes in Humans