Natural selection

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Across
  1. 2. describes a population or species that is physically isolated from other similar groups by an extrinsic barrier to dispersal.
  2. 5. the development of a new species
  3. 7. The process that results in the adaptation of an organism to its environment by means of selectively reproducing changes in its genotype, or genetic constitution.
  4. 9. barriers that act before fertilisation, ensuring preferential acceptance of conspecific pollen
Down
  1. 1. a process of gradual change that takes place over many generations, during which species of animals, plants, or insects slowly change some of their physical characteristics
  2. 3. a class of things of the same kind and with the same name
  3. 4. Any procedure in which a given species of organism, present in a particular sample or environment, is obtained in pure culture.
  4. 5. populations, varieties, or species that occur in the same place at the same time.
  5. 6. barriers that act after fertilisation, resulting in hybrid inviability and hybrid breakdown that reduces or prevents reproduction in the next generation.
  6. 8. an offspring of two animals or plants of different races, breeds, varieties, species, or genera