1	Natural Selection		_____	statistical technique used to measure heritability; examines similarity of traits between parents and their offspring
2	Heritable		_____	a trait that enhances fitness
3	Evolution		_____	evolutionary process that optimizes animal traits to fit their current environments
4	Parent-offspring Regression		_____	selection that favors one group over another group within the same species
5	Selection Experiment		_____	the trait value that has the highest fitness in a population in a specific environment
6	Adaptation (trait)		_____	selection that favors individuals with either one of two extreme phenotypes
7	Adaptation (process)		_____	an experiment in which different groups of individuals are exposed to differential selection on a trait
8	Directional Selection		_____	natural selection that involves both group and individual selection
9	Disruptive Selection		_____	individual fitness + fitness due to kin selection
10	Stabilizing Selection		_____	pronounced morphological differences between the sexes
11	Optimal Trait Value		_____	a trait that is passed on from parent to offspring
12	Cost-benefit Approach		_____	natural selection that acts on heritable traits that affect reproduction
13	Individual Selection		_____	natural selection acting on individuals
14	Group Selection		_____	differential reproduction and survivorship among individuals in a population that results in adaptive evolution
15	Kin Selection		_____	selection that favors individuals with intermediate phenotypes
16	Inclusive Fitness		_____	a form of natural selection used to explain altruism; based on the idea that individuals can increase their own fitness by helping close relatives that have a high percent of shared genes
17	Multilevel Selection		_____	changes in allele frequency in a population over time
18	Sexual Selection		_____	method used to study behavior adaptations by examining fitness costs and benefits of various traits
19	Sexual Dimorphism		_____	selection that favors individuals with one extreme phenotype