Evolution & Natural Selection

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Across
  1. 4. The process where distantly related organisms independently evolve similar traits to adapt to similar necessities.
  2. 6. The study of the formation and development of an embryo and fetus.
  3. 9. The loss of genetic variation that occurs after outside forces destroy most of a population.
  4. 10. A term that describes mechanisms of gene transfer from one population to another.
  5. 11. A microorganism that infects cells and may cause disease.
  6. 16. The reduction in genomic variability that occurs when a small group of individuals becomes separated from a larger population.
  7. 17. Asexual reproduction by a separation of the body into two new bodies.
  8. 18. The complete disappearance of a species from Earth.
  9. 19. Choosing parents with particular characteristics to breed together and produce offspring with more desirable characteristics.
  10. 22. The adjustment of organisms to their environment in order to improve their chances at survival in that environment.
Down
  1. 1. How a new kind of plant or animal species is created.
  2. 2. Organisms whose cells lack a nucleus and other organelles.
  3. 3. The process through which populations of living organisms adapt and change.
  4. 5. The change in the characteristics of a species over several generations and relies on the process of natural selection.
  5. 7. The process by which different organisms having common ancestors develop different traits or characteristics to adapt to the changing environmental conditions and needs
  6. 8. Evidence of bacteria, animals, and plants that lived in the past.
  7. 12. Cells containing membrane-bound organelles and are the basis for both unicellular and multicellular organisms.
  8. 13. Occurs when a virus has infected a cell, replicated new virus particles, and bursts through the cell membrane.
  9. 14. The change in frequency of an existing gene variant in the population due to random chance.
  10. 15. The process by which individuals compete for access to mates and fertilization opportunities
  11. 20. A large group of single-cell microorganisms.
  12. 21. A branch of science that is related to the formation, growth, and development of embryo.