Speciation and Natural Selection Crossword

The formation of a new species from an ancestral species due to evolution.
A natural selection process in which the extreme phenotypes are selected for and the intermediate phenotype(s) are selected against.
A collection of all the genes found in a species.
This term describes an event in which part of a population becomes physically separated from its original population by a mountain chain, large river, deep canyon or other physical barrier.
The formation of new species from an ancestral species while both continue to occupy the same geographic region.
A(n) __________________ is any physical, behavioral, or physiological characteristic that makes an organism better fit in its environment.
Any change in the genetic make up of an organism is called a(n) __________.
A natural selection process in which the extreme phenotypes are selected against and the intermediate phenotype(s) are favored.
______________ occurs when members of neighboring population move freely back and forth between the two populations and interbreed with members of the neighboring population.
The term ________________ makes reference to the easily observed physical characteristics of an organism.
Randon changes in the gene frequencies of a population as a result of random sampling of that population or other random events.
A group of organisms that are morphologically similar, actively or potentially interbreeding, and reproductively isolated from other such groups.
______________ is a measure of an organism's ability to survive and reproduce in its environment.
A process in which organisms that are best adapted to their environment survive and reproduce more successfully that those that are less adapted.