This may reflect lower evolutionary constraints on the structure of this region in the two proteins.

Because pseudogenes are presumed to change without evolutionary constraint, they can serve as a useful model of the type and frequencies of various spontaneous genetic mutations.

Caterpillars: ecological and evolutionary constraints on foraging.

A utilitarian approach to evolutionary constraint.

The loss raises the question of the evolutionary constraints that have prevented similar changes in the other chordates.

The author "remains in complete control of his material" as he "writes about biology as destiny and about the search for individual freedom within evolutionary constraints."

Dr. Pinker, who speaks for the east pole, said that evolutionary constraints posed no such limits.

There are also strong evolutionary constraints on this dispersal mechanism.

He writes about biology as destiny, and about the search for individual freedom within evolutionary constraints.

"As large as you need and as small as you can" has been said to summarize the opposite evolutionary constraints on human brain size.