Colin Smith Biology Evolution

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Across
  1. 3. is the amount of time it takes for ½ of the original radioactive isotope to decay or change into its decay product.
  2. 9. is the number of times that the allele occurs in a gene pool, compared with the number of times other alleles for the same gene occur. (How often an allele occurs).
  3. 10. _____ structures bodily structures that are similar in structure, but different in function, due to sharing a common ancestor.
Down
  1. 1. ____ selection: one end of bell-curve has higher fitness.
  2. 2. _______ selection: both ends of the curve have a higher fitness than the middle.
  3. 4. _____ selection: middle of the curve has higher fitness.
  4. 5. a group of individuals of the same species that can interbreed.
  5. 6. _____ structures Structures that serve no function but useful structures in earlier ancestors
  6. 7. is all the genes, and their alleles, in the population.
  7. 8. ______ structures bodily structures that are similar in function, but not in structure.