Evolution and Natural Selection

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Across
  1. 3. 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.
  2. 5. infectious agent that replicates only inside the living cells of an organism
  3. 6. reproduction that involves a complex life cycle in which a gamete with a single set of chromosomes combines with another gamete to produce a zygote that develops into an organism composed of cells with two sets of chromosomes
  4. 9. a change or the process of change by which an organism or species becomes better suited to its environment
  5. 10. the process by which humans use animal breeding and plant breeding to selectively develop particular phenotypic traits by choosing which typically animal or plant males and females will sexually reproduce and have offspring together
  6. 12. the transfer of genetic material from one population to another.
  7. 13. a mechanism of evolution
  8. 16. non-functional features fully developed and functioning in earlier species but serve little or no present purpose for an organism
  9. 17. asexual reproduction by a separation of the body into two new bodies
  10. 19. the reciprocal evolutionary change in a set of interacting populations over time resulting from the interactions between those populations
  11. 20. happens when germs like bacteria and fungi develop the ability to defeat the drugs designed to kill them
Down
  1. 1. reproduction that does not involve the fusion of gametes or change in the number of chromosomes.
  2. 2. the change in frequency of an existing gene variant in the population due to random chance
  3. 4. the difference in DNA sequences between individuals within a population
  4. 7. A form of viral reproduction involving the fusion of the nucleic acid of a bacteriophage with that of a host, followed by proliferation of the resulting prophage
  5. 8. the study of the formation and development of an embryo and fetus
  6. 11. dying out or does not exist anymore
  7. 14. occurs when a group within a species separates from other members of its species and develops its own unique characteristics
  8. 15. the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population
  9. 18. microscopic living organisms that have only one cell