Natural Selection and Evolution

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Across
  1. 1. Selection: A type of natural selection where traits increase an organism’s chance of mating (e.g., bright feathers, courtship behaviours).
  2. 7. Record: Evidence of past life preserved in sedimentary rock, showing changes in life forms over time and helping to track evolutionary transitions.
  3. 9. Structures that have the same basic plan but may serve different functions. These similarities suggest descent from a common ancestor.
  4. 11. A limb structure with five digits (fingers or toes), found in many vertebrates, used as evidence of common ancestry through homologous structures.
  5. 12. Selection: A process where humans breed plants or animals for particular genetic traits, such as higher yield or desirable characteristics.
  6. 14. The variety of all life forms on Earth, including genetic, species, and ecosystem diversity.
  7. 16. The genetic makeup of an organism, representing the alleles inherited from the parents for a particular trait.
  8. 18. The variety of all life forms on Earth, including genetic diversity (within species), species diversity (between species), and ecosystem diversity.
Down
  1. 2. The genetic change in species over many generations, resulting in new species.
  2. 3. A group of organisms that normally interbreed in nature to produce fertile offspring.
  3. 4. Agent: Any factor in the environment (biotic or abiotic) that affects an organism’s survival. Those best adapted survive.
  4. 5. Differences in characteristics between individuals in a population, caused by genetic mutation or sexual reproduction.
  5. 6. Anatomy: The study of similarities and differences in the structure of organisms. The more similarities, the more closely related the species are.
  6. 8. The process by which new species arise, usually through geographic isolation, natural selection, and reproductive isolation.
  7. 10. Selection: The process where individuals with favourable traits are more likely to survive and reproduce, passing on those traits to the next generation.
  8. 13. The observable physical or behavioural traits of an organism, resulting from the interaction of its genotype and environment.
  9. 15. Breeding: The process of choosing parents with particular characteristics to breed together and produce offspring with desired traits.
  10. 17. The genetic change in species over many generations, resulting in new species.