Across
- 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.
Down
- 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