Across
- 7. Natural selection in which individuals at the upper and lower ends of the curve have higher fitness than individuals near the middle of the curve.
- 8. Form of natural selection in which individuals near the center of a distribution curve have higher fitness than individuals at either end of the curve.
- 11. The evolution of a species by gradual accumulation of a small genetic change over long periods of time.
- 13. Separation of a species or population so that they no longer interbreed and evolve into two separate species.
Down
- 1. When individuals select mates based on heritable traits.
- 2. Change in allele frequencies as a result of the migration of a small subgroup of population.
- 3. Form of reproductive isolation in which two populations develop differences in courtship rituals or other behaviors that prevent them from breeding.
- 4. Pattern of evolution in which long stable periods are interrupted by brief periods of more rapid change.
- 5. Form of natural selection in which individuals at one end of a distribution curve have a higher fitness than individuals in the middle or at the other end of the curve.
- 6. Form of reproductive isolation in which two populations are separated by geographic barriers such as rivers, mountains, or bodies of water, leading to the formation of two separate subspecies.
- 9. Form of reproductive isolation in which two or more species reproduce at different times.
- 10. A change in allele frequency following a dramatic reduction in size of population.
- 11. The transfer of alleles or genes from one population to another.
- 12. Random change in allele frequency caused by a series of chance occurrences that cause an allele to become more or less common in a population.