Unit 7 Choice Board

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Across
  1. 4. Fertilized egg cell that results from the union of an ovum or a sperm
  2. 5. Change in the heritable characteristics of biological populations
  3. 8. Branching diagram showing the cladistic relationship between a number of species.
  4. 10. English biologest widely known for his contributions to evolutionary biology
  5. 11. Carefully throughout explanation for observations of the natural world.
  6. 14. Related genes that specify regions of the body plan.
  7. 15. Germ layer that arises during gastrulation.
  8. 16. How well an organism is adapted to their enviornment.
  9. 17. Includes the bilaterally symmetrical animals
  10. 18. Occurs when 2 or more species reciprocally affect each others evolution
  11. 20. When an organism no longer exists.
Down
  1. 1. Branch of biology and medicine concerned with the study of embryos and their development
  2. 2. Animal embryo at the early stage of development when it's a hollow ball of cells
  3. 3. Evolutionary process by which populations evolve to become distinct species
  4. 6. Process by which populations of living organisms adapt and change
  5. 7. Branch of science concerned with fossil animals and plants
  6. 9. How an organism adjusts to their enviornment.
  7. 12. The innermost of the 3 germ layers
  8. 13. Figurative term for a technique that uses the mutation rate of biomolecules to deduce the time
  9. 19. Outermost of the 3 germ layers or masses of cells.