Across
- 4. How a new kind of plant or animal species is created.
- 8. Something an animal does usually in response to some type of external stimulus in order to survive.
- 12. Any cell or organism that possesses a clearly defined nucleus.
- 14. The reduction in genomic variability that occurs when a small group of individuals becomes separated from a larger population.
- 15. The capacity of bacteria to withstand the effects of a harmful chemical agent.
- 16. The transfer of genetic material from one population to another.
- 17. One of two or more versions of a genetic sequence at a particular region on a chromosome.
- 19. The production of new organisms by the combination of genetic information of two individuals of different sexes.
- 20. The process through which populations of living organisms adapt and change.
Down
- 1. The presence of differences in sequences of genes between individual organisms of a species.
- 2. An internal body process to regulate and maintain homeostasis for an organism to survive in the environment in which it exists.
- 3. The evolutionary process whereby an organism becomes better able to live in its habitat or habitats.
- 5. An extreme example of genetic drift that happens when the size of a population is severely reduced.
- 6. Single-celled microorganisms that lack a nuclear membrane, are metabolically active and divided by binary fission.
- 7. Symbiotically break down food for other organisms, producing food through photosynthesis and chemosynthesis, and decomposing waste.
- 9. The change in frequency of an existing gene variant in the population due to random chance.
- 10. The variation and distribution of traits in a population depend on genetic and environmental factors.
- 11. The complete disappearance of a species from Earth.
- 13. Any substance that inhibits the growth and replication of a bacterium or kills it outright.
- 18. A mode of reproduction in which a new offspring is produced by a single parent.