Natural Selection and Speciation

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Across
  1. 1. group of organisms that can interbreed to produce fertile offspring under natural conditions
  2. 3. keeping interbreeding groups apart by some barrier or mechanism
  3. 8. selective breeding in which closely related individuals are allowed to breed
  4. 13. the study of the embryos of different species
  5. 14. the environmental factor that acts on the population during natural selection
  6. 16. the process by which one species splits into two or more separate species
  7. 17. the number and range of different species that exist on Earth or in an ecosystem
  8. 19. selection the process by which people choose to breed particular organisms with desirable features; also known as selective breeding or directed selection
  9. 20. the process where an environmental factor acts on a population and results in some organisms having more offspring than others
Down
  1. 2. change in the characteristics of a species over many generations
  2. 4. chemicals made by organisms such as fungi to defend them against bacteria
  3. 5. a special case of natural selection where the environmental factor is the selection of a mate
  4. 6. selective breeding by combining a desirable feature of one individual with another in the offspring
  5. 7. structures that are controlled by some of the same inherited genes
  6. 9. a map of all the places where a species occurs
  7. 10. fossils that have features of two or more different groups
  8. 11. differences in characteristics due to different genes
  9. 12. the time between the birth of an individual and when they produce their own offspring
  10. 15. inherited ability of a species to withstand chemicals such as pesticides
  11. 18. structures that appear similar or have the same function but are controlled by different genes