Across
- 2. form of reproductive isolation in which two populations have differences in courtship rituals or other types of bahavior that prevent then from interbreeding
- 5. separation of species or populations so that they cannot interbreed and produce fertile offspring
- 8. trait controlled by two or more genes
- 12. form of natural selection by which the center of the curve remains in its current position; occurs when individuals near the center of a distribution curve have higher fitness than individuals at either end
- 13. number of times an allele occurs in a gene pool compared with the number of times other alleles occur
- 15. principle that allele frequencies in a population will remain constant unless one or more factors cause the frequencies to change
- 16. form of reproductive isolation in which two populations reproduce at different times
Down
- 1. trait controlled by a single gene that has two alleles
- 3. situation in which allele frequencies remain constant
- 4. form of natural selection in which the entire curve moves; occurs when individuals at one end of a distribution curve have higher fitness than individuals near the middle
- 6. form of reproductive isolation in which two populations are separated physically by geographic barriers such as rivers, moutains, or stretches of water
- 7. form of natural selection in which a single curve splits into two; occurs when individuals at the upper and lower ends of a distribution curve have higher fitness than individuals near the middle
- 9. random change in allele frequencies that occurs in small populatioons
- 10. change in allele frequencies as a result of the migration of a small subgroup of a population
- 11. formation of new species
- 14. combined genetic information of all the members of a particular population