5.2 Natural Selection

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Across
  1. 3. the range of genotypes and phenotypes within a population, caused by different alleles.
  2. 4. 2 words. an environmental variable that acts to remove poorly adapted individuals.
  3. 6. a feature of an organism that favours its survival to reproductive age. Adaptations can be behavioural, physiological, or structural.
  4. 8. a chemical produced by microbes to kill off competing microbes.
  5. 9. a naturally interbreeding group of organisms with similar morphology.
  6. 11. a change in DNA, the driving force behind variation for natural selection
  7. 12. Form of moth which was at high levels when the environment became polluted
Down
  1. 1. Form of moth which was normal and in high numbers in unpolluted forests
  2. 2. 4 words. The expression for natural selection, where only the best adapted organisms survive to pass their genes on to the next generation
  3. 5. 2 words. survival to reproductive age of the varieties that are best adapted to existing environmental conditions.
  4. 7. reduction division involving the production of gametes that introduces increased variation.
  5. 10. reproduction involving the union of gametes.