Biology Unit 7

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Across
  1. 4. the close external resemblance of an animal or plant (or part of one) to another animal, plant, or inanimate object.
  2. 5. the disguising of military personnel, equipment, and installations by painting or covering them to make them blend in with their surroundings.
  3. 8. effect the reduced genetic diversity which results when a population is descended from a small number of colonizing ancestors.
  4. 9. a policy of gradual reform rather than sudden change or revolution.
  5. 11. a community of animals, plants, or humans among whose members interbreeding occurs.
  6. 12. forming a very small remnant of something that was once much larger or more noticeable.
  7. 13. an organism's ability to survive and reproduce in a particular environment.
  8. 14. selection the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.
  9. 15. pool the stock of different genes in an interbreeding population.
  10. 16. a situation that causes delay in a process or system.
  11. 17. the branch of biology and medicine concerned with the study of embryos and their development.
Down
  1. 1. having the same relation, relative position, or structure.
  2. 2. the formation of new and distinct species in the course of evolution.
  3. 3. a change or the process of change by which an organism or species becomes better suited to its environment.
  4. 6. the state of being diverse; variety.
  5. 7. dating used to arrange geological events, and the rocks they leave behind, in a sequence.
  6. 9. drift variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.
  7. 10. frequency calculated by dividing the number of times the allele of interest is observed in a population by the total number of copies of all the alleles at that particular genetic locus in the population.
  8. 12. the occurrence of an organism in more than one distinct color or form.