evolution and natural selection

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Across
  1. 6. the process of adapting to something
  2. 12. fossil record provides snapshots of the past which, when assembled, illustrate a panorama
  3. 13. an infectious agent that can only replicate within a host organism
  4. 14. one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.
  5. 15. the reciprocal evolutionary change in a set of interacting populations over time resulting from the interactions between those populations
  6. 17. the complete disappearance of a species from Earth
  7. 19. the main method of virus reproduction
  8. 20. a mechanism of evolution
Down
  1. 1. a viral reproductive stage where the virus's DNA is replicated using the host cell's DNA
  2. 2. affect which living things of the same kind survive long enough to produce young
  3. 3. When a male gamete and a female gamete are involved in reproduction
  4. 4. asexual reproduction by a separation of the body into two new bodies
  5. 5. features of an organism that are considered to have lost much or all of their original function through evolution
  6. 7. a mode of reproduction in which only one parent is involved to reproduce offspring
  7. 8. the study of the formation and development of an embryo and fetus
  8. 9. occurs when a group within a species separates from other members of its species and develops its own unique characteristics
  9. 10. the transfer of genetic material from one population to another
  10. 11. the change in frequency of an existing gene variant in the population due to random chance
  11. 16. the reduction in genomic variability that occurs when a small group of individuals becomes separated from a larger population
  12. 18. microscopic living organisms that have only one cell