Evolution and Natural Selection

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Across
  1. 2. when a group within a species separates from other members of its species and develops its own unique characteristics
  2. 5. a branch of science that is related to the formation, growth, and development of embryo
  3. 7. asexual reproduction by a separation of the body into two new bodies.
  4. 12. the biological mechanism by which organisms adjust to new environments or to changes in their current environment
  5. 13. the process by which interbreeding species diverged into two or more evolutionary groups.
  6. 16. a single-celled organism that lacks a nucleus and other membrane-bound organelles.
  7. 17. The kind of reproduction in which it is not necessary to have two parents to produce offspring.
  8. 18. the reproduction of viruses using a host cell to manufacture more viruses; the viruses then burst out of the cell
  9. 19. the process by which individuals compete for access to mates and fertilization opportunities.
  10. 20. a term that describes mechanisms of gene transfer from one population to another
Down
  1. 1. a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some that can cause disease.
  2. 3. the change in frequency of an existing gene variant in the population due to random chance.
  3. 4. the complete disappearance of a species from Earth
  4. 6. happens when germs like bacteria and fungi develop the ability to defeat the drugs designed to kill them.
  5. 8. provides a record of how creatures evolved and how this process can be represented by a 'tree of life', showing that all species are related to each other.
  6. 9. organisms best adjusted to their environment are the most successful in surviving and reproducing.
  7. 10. the process through which populations of living organisms adapt and change
  8. 11. the production of new living organisms by combining genetic information from two individuals of different types (sexes)
  9. 14. any cell or organism that possesses a clearly defined nucleus.
  10. 15. an infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.