| A | B |
|---|
| Bottleneck Effect | drastic reduction in population size brought about by severe pressure |
| Founder Effect | Type of bottleneck where few individuals that establish a new population differ in allele frequencies relative to the original population |
| Stabilizing Selection | intermediate phenotypes are favored over extremes at both ends of the range in variation |
| Disruptive Selection | favors different forms of a trait at both ends of the range of variation |
| Sexual Selection | an outcome of differences in sucess at attracting mates and reproducing among individuals of a population |
| Genetic Drift | change in allele freqencies over generations due to chance alone |
| Gene Flow | allele enters and leaves a population by immigration and emigration |
| Dimorphism | persistence of two forms of the same trait in a population |
| Polymorphism | persistence of two or more quality different forms of a trait in a population |
| Sexual Dimorphism | a notable difference between male and female phenotypes in a population |
| Allopatric Speciation | a physical barrier arises and seperates populations or subpopulations of a species |
| Sympatric Speciation | occurs inside the home range of a species in the absence of a physical barrier |
| Extinction | irrevocable loss of a species |
| Monophyletic Group | a set of species that sharea derived trait |
| Jean Baptiste Lamarck | stated offspring inherit traits that a parent aquired in its lifetime |
| allele frequency | p+q=1.0 |
