bio

2. structures, similar physical features in organisms that share a common ancestor, but the features serve completely different functions.
4. (in terms of natural selection), Intraspecific competition occurs between members of the same species
6. effect, an extreme example of genetic drift that happens when the size of a population is severely reduced.
8. frequency, how frequently a particular allele appears in a population
9. the change in the characteristics of a species over several generations
11. structures, Structures that have no apparent function and appear to be residual parts from a past ancestor
14. Record, made up of all the fossils that have been found, along with their relative ages.
15. Selection, a mechanism of evolution.
16. flow, the transfer of genetic material from one population to another.

1. anatomy, the study of similarities in the anatomical structure of different species.
3. effect, concentrated among the Amish because they marry within their own community
5. (in terms of natural selection), the trait that natural selection “sees” and other traits change only because they are associated genetically with fitness
7. drift, the change in frequency of an existing gene variant in the population due to random chance
10. the process by which a species becomes fitted to its environment
12. variation, the difference in DNA sequences between individuals within a population
13. one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome