chapter 17

2. change in the genetic material of a cell
4. scientific study of heredity
6. change in allele frequency following a dramatic loss of population
7. a trait controlled by one gene that has two alleles
8. change over time
10. reproductive isolation in 2 or more species reproduce at the different times
11. breed and reproduce fertile offspring
15. separation of a species that can no longer interbreed
16. any necessity of life, such as water, nutrients, light, food, or space
17. random change in the frequency of the alleles in a gene pool

1. a trait controlled by two or more genes
3. specific characteristic of an individual
5. allele frequencies in a population remain the same
9. contains all the alleles of all the genes in a population
12. change in allele frequency that results from a small group starting a new population
13. number of times an allele occurs in a gene pool
14. uses mutation rates in DNA to estimate how long 2 organisms shared common ancestor
18. well-tested explanation