Across
- 4. selection may favour alternative morphs in alternative environmental conditions
- 6. the variability in observable traits among individuals in a population
- 7. an approach where comparison of species is used to test hypotheses about adaptation or other evolutionary phenomena
- 8. occurs when intermediate phenotypes have the highest fitness (reduces phenotypic variance)
- 9. occurs when the most extreme phenotypes have the highest fitness (increases phenotypic variance by eliminating intermediate forms)
Down
- 1. a situation in which the relative fitness of a phenotype is a function of its frequency in a population
- 2. changes in the mean value of a trait
- 3. reproductive success over a lifetime
- 5. the process of change by which an organism or species becomes better suited to its environment