Across
- 3. The physical separation of members of a population.
- 5. bursts of evolutionary activity & speciation
- 7. is the drifting of the frequency of an allele relative to that of the other alleles in a population over time
- 8. based on the Law of Superposition which states that in undisturbed rock sequences the bottom layers are older than the top layers
- 10. phenomenon when a population has a sudden reduction in the gene pool due to natural environmental events, natural disasters, disease, or human involvement
- 13. scientist who created 3 theories about evolution still used today
- 15. the range of different inherited traits within a species
- 17. refers to the process by which interbreeding species diverged into two or more evolutionary groups
- 18. any difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences
- 20. an organism's reproductive cells
- 21. is selection and variation that happens more gradually
- 25. is used to describe an alle, gene, or trait that is expressed
- 28. the organisms that are better suited to their environment survive the pressure of selective agents.
- 29. believes the animals that live here are not found anywhere else on Earth
Down
- 1. the diversification of a group of organisms into forms filling different ecological niches
- 2. the net result of all can go wrong with DNA during the life cycle
- 4. any substantial increase in the amount of extinction (lineage termination) suffered by more than one geographically wide-spread higher taxon during a relatively short interval of geologic time, resulting in an at least temporary decline in their standing diversity
- 6. an individuals observable traits, such as height, eye color, and blood type
- 9. the proccess of determining the nucleic acid sequence
- 11. how a new kind of plant or animal species is created
- 12. is a permanent, heritable change in the nucleotide sequence or the process by which such a change occurs in a gene or in a chromosome
- 14. the total genetic diversity found within a population or a species
- 16. process in which an organism adapts to its environment through selectively reproducing changes in its genotype
- 19. change in a kind of organism overtime; process by which modern organisms have descended from ancient ones
- 22. is one in which the effect is not tangible, or is masked by the effects of the dominant gene
- 23. an individuals collection of genes
- 24. the reduction in genetic variation that results when a small subset of a large population is used to establish a new colony
- 26. describes the role an organism plays in a community
- 27. the process in which two or more populations of an ancestral species accumulate independent genetic changes (mutations) through time