Biology 8th Edition by Kenneth Mason ,Jonathan Losos,Susan Singer,Peter Raven,George Johnson

تمرين 4

The loss of functional olfactory receptor (OR) genes in humans compared with chimps may be explained by reliance on other sensory systems and therefore weakened selection against individuals that lose olfactory capabilities. Could natural selection work in any other way to decrease the number of human OR genes without selecting for OR function in chimps