Environmental Biology

2. isolation /The physical separation of members of a population
4. /The basic unit of heredity passed from parent to child
5. selection /the identification by humans of desirable traits in plants and animals
6. drift /variation in the relative frequency of different genotypes in a small population
10. / modification of an organism or its parts that makes it more fit for existence under the conditions of its environment
11. isolation /occurs when mismatches in mating traits (signals and/or preferences) prevent mating between two species/populations
13. /the dying of a species
15. selection /the process whereby organisms better adapted to their environment tend to survive and produce more offspring
16. /Any change in the DNA sequence of a cell
17. structure /similar physical features in organisms that share a common ancestor
20. isolation /The separation of groups of organisms as a result of changes in their ecology or in the environment in which they live
21. structure /features of different species that are similar in function but not necessarily in structure

1. divergence /the process in which two or more populations of an ancestral species accumulate independent genetic changes
3. isolation /a physical incompatibility between reproductive organs of two organism
7. /the formation of new and distinct species in the course of evolution
8. /
9. structure /Structures that have no apparent function and appear to be residual parts from a past ancestor
12. / changes over time
14. isolation /occurs when two populations differ in their periods of activity or reproductive cycles
18. of the fittest /organisms best adjusted to their environment
19. /an organism's ability to pass its genetic material to its offspring