The average surface area of leaves has been decreasing in successive generations. This is an example of a. stabilizing selection. Two large populations were once united by exchanging genes via sexual reproduction. Now when they hybridize the offspring are infertile. This is an example of a. character displacement.
Sympatric speciation occurs when a. populations of organisms once separated become reunited.
The process in which a population moves into a relatively unexploited environment and then undergoes rapid evolutionary divergence to produce many separate species is called a. adaptive radiation . In evolution, an evolutionary bottleneck is best described as a. loss of genetic variability in a population during a period of reduced population size. In zoos, lions and tigers mate and produce viable hybrid offspring called tigons or ligers. Hybrids were never recorded in Asia, however, where their ranges once overlapped. All of the following lines of evidence can be used to determine relatedness among organisms except a. similar amino acid sequences in proteins.