Across
- 3. reproduction that does not involve the fusion of gametes or change in the number of chromosomes
- 8. the introduction of genetic material from one population of a species to another, thereby changing the composition of the gene pool of the receiving population
- 10. sharp reduction in the size of a population due to environmental events
- 11. alternative form of a gene
- 13. organisms with traits best suited to their environment are more likely to survive and reproduce
- 14. microscopic organisms not visible with the naked eye
- 15. the termination of a kind of organism
- 16. differences in the frequency distributions of the states of a specified traits
- 19. the formation of new and distinct species in the course of evolution.
- 20. the influence of closely associated species on each other in their evolution
Down
- 1. any cell or organism that possesses a clearly defined nucleus
- 2. a change or the process of change by which an organism or species becomes better suited to its environment
- 4. the production of new living organisms by combining genetic information from two individuals of different types
- 5. the ability to defeat the drugs designed to kill them
- 6. change or difference within a trait
- 7. variation in the relative frequency of different genotypes in a small population
- 9. organisms best adjusted to their environment are the most successful in surviving and reproducing
- 12. diversity in gene frequencies
- 17. any organism that lacks a distinct nucleus and other organelles due to the absence of internal membranes
- 18. the reduced genetic diversity which results when a population is descended from a small number of colonizing ancestors.