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

Question

Quizplus · Accepted Answer

Some of the olfactory receptor genes in humans have been inactivated, reducing our olfactory capabilities compared to other primates. This is because humans rely more on visual and auditory cues for survival, whereas other primates use their sense of smell more heavily. As a result, some OR genes in humans have become unnecessary and have been lost or inactivated through evolution.

Some of the Olfactory Receptor (OR)genes in Humans