Ms.Scurlock/Ms.McNeil 3rd Period Vocab. Homework

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Across
  1. 4. A change or alteration, as in form or nature.
  2. 9. A state of rest or balance due to the equal action of opposing forces
  3. 10. The doctrine that certain vast geological changes in the earth's history were caused by catastrophes rather than gradual evolutionary processes.
  4. 11. The act, means, or result of obscuring things to deceive an enemy, as by painting or screening objects so that they are lost to view in the background, or by making up objects that from a distance have the appearance of fortifications, guns, roads, etc.
  5. 15. Is a type of natural selection in which genetic diversity decreases and the population mean stabilizes on a particular trait value.
  6. 20. Also called diversifying selection, describes changes in population genetics in which extreme values for a trait are favored over intermediate values.
Down
  1. 1. The process by which forms of life having traits that better enable them to adapt to specific environmental pressures, as predators, changes in climate, or competition for food or mates, will tend to survive and reproduce in greater numbers than others of their kind, thus ensuring the perpetuation of those favorable traits in succeeding generations.
  2. 2. A relationship between two species of organisms in which both benefit from the association.
  3. 3. The principle or policy of achieving some goal by gradual steps rather than by drastic change.
  4. 5. The living together of two dissimilar organisms, as in mutualism, commensalism, amensalism, or parasitism.
  5. 6. Describes the case in which the heterozygote genotype has a higher relative fitness than either the homozygote dominant or homozygote recessive genotype.
  6. 7. Is a mode of natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype.
  7. 8. The act of adapting.
  8. 12. Reproduction, as budding, fission, or spore formation, not involving the union of gametes.
  9. 13. Reproduction involving the union of gametes.
  10. 14. The branch of genetics concerned with the hereditary makeup of populations.
  11. 16. To mark or divide (something written) with punctuation marks in order to make the meaning clear.
  12. 17. Any process of formation or growth; development
  13. 18. Random changes in the frequency of alleles in a gene pool, usually of small populations.
  14. 19. Any cellular organism that has no nuclear membrane
  15. 21. Any organism having as its fundamental structural unit a cell type that contains specialized organelles