Topic 5.2 Natural Selection

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Across
  1. 4. A process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals because of those traits. (7, 9)
  2. 5. A feature of an organism that favours its survival to reproductive age. (11)
  3. 6. ___________ reproduction: Reproduction involving the union of gametes. (6)
  4. 8. A group of organisms of one species that interbreed and live in the same place at the same time (10)
  5. 11. A chemical produced by microbes to kill off competing microbes. (10)
  6. 13. The relatively rapid diversification of several new species from a recent ancestral source to occupy new niches (8, 9)
  7. 15. Biological ___________ Ability to survive and reproduce (7)
  8. 17. _______________ Competition: Competition between individuals of the same species for resources, access to mates etc. (13)
  9. 18. Cell division that produces haploid gametes in sexually reproducing organisms - independent assortment and crossing over are factors that lead to variation. (7)
  10. 19. pressure ___________ pressure: The factors in an ecosystem that make it hard to survive and reproduce (food, predators, temperature, mates). Also called "environmental pressure" (18)
Down
  1. 1. Several species of finch's evolved to have different beak shapes to occupy a specific niche on the Galapagos islands. (8,7)
  2. 2. A change in the genetic sequence (DNA) - substitution, insertion, or deletion of bases (8)
  3. 3. Chain of islands near South America where Darwin developed his theory of natural selection by studying the unique life there. (9)
  4. 6. An environmental variable that acts to remove poorly adapted individuals. (9, 8)
  5. 7. Galapagos island on which the Grants studied evolution of Darwin's finches (6, 5)
  6. 9. A characteristic that an organism can pass on to its offspring through its genes. (5)
  7. 10. The range of phenotypes within a population (9)
  8. 12. Causes of ___________ Mutation, meiosis and sexual reproduction (9)
  9. 14. Differences in a population (9)
  10. 16. Trait evolving rapidly in many species of prokaryotes due to overuse of antibiotics, especially in agriculture. (10)