Evolution and Natural Selection

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Across
  1. 2. metabolic or physiologic adjustment within the cell, or tissues, of an organism in response to an environmental stimulus resulting in the improved ability of that organism to cope with its changing environment.
  2. 5. infectious microbe consisting of a segment of nucleic acid (either DNA or RNA) surrounded by a protein coat.
  3. 7. organisms whose cells lack a nucleus and other organelles.
  4. 8. process through which populations of living organisms adapt and change.
  5. 11. arise from gene variants (also called mutations) or from a normal process in which genetic material is rearranged as a cell is getting ready to divide (known as genetic recombination)
  6. 13. change in frequency of an existing gene variant in the population due to random chance.
  7. 14. process of natural selection, a mechanism that drives evolutionary change
  8. 15. any heritable trait that helps an organism, such as a plant or animal, survive and reproduce in its environment.
  9. 16. depend on genetic and environmental factors.
  10. 17. complete disappearance of a species from Earth.
  11. 18. describes the phenomenon when a population has a sudden reduction in the gene pool due to natural environmental events, natural disasters, disease, or human involvement
  12. 19. when a group within a species separates from other members of its species and develops its own unique characteristics.
  13. 20. organisms whose cells contain a nucleus and other membrane-bound organelles.
Down
  1. 1. one parent copies itself to form a genetically identical offspring.
  2. 3. organism combines the genetic information from each of its parents and is genetically unique.
  3. 4. when germs like bacteria and fungi develop the ability to defeat the drugs designed to kill them.
  4. 6. process by which new species form.
  5. 9. movement of genes from one population to another population.
  6. 10. reduction in genomic variability that occurs when a small group of individuals becomes separated from a larger population.
  7. 12. something an animal does usually in response to some type of external stimulus in order to survive.