Unit 1 Vocab

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Across
  1. 2. an organism's particular genetic makeup
  2. 4. a trait that helps identify an organism
  3. 5. any remains, trace, or imprint of animal or plant life preserved in Earth's crust
  4. 6. the passing of traits from parent to offspring
  5. 8. a gene composted of two identical alleles
  6. 11. the variety of life that exists in a particular habitat or ecosystem
  7. 14. a form of a gene that is expressed as the trait whenever it is present
  8. 15. variations of genes that determine traits in organisms
  9. 16. a random change in an organism's DNA; it can have positive, negative, or neutral effect on the organism
  10. 17. a well-tested scientific explanation
  11. 20. any living plant, animal, fungus, or bacterium
  12. 21. a theory that says sedimentary rocks on the bottom of a stack are older than the rocks above them
  13. 23. all the fossils on Earth
  14. 24. a molecule that contains an organism's genetic information
  15. 25. a structure made of coiled DNA that transfers hereditary information to the next generation
  16. 27. no longer existing
  17. 30. a molecule that is part of cells and cell structures; determines the traits of an organism
  18. 31. an organism related to an organism that lived before
  19. 33. a trait that increases an organism's chances of surviving and reproducing to pass on its genes
  20. 35. a structure, characteristic, or behavior of an organism, such as eye color, plant height or pattern of migration
  21. 36. a form of a gene that is expressed only when a dominant allele is not present
  22. 38. the specific way a feature is expressed in an individual organism, for example, blue and green are traits for eye color
Down
  1. 1. belonging to the same group or family
  2. 3. the theory that all species are descended from common ancestors who have changed over time by means of natural selection
  3. 7. an organism from the past that is related to all the organisms in the group
  4. 9. the range of expression of a trait within a population
  5. 10. the traits produced by the genotype; the expression of genes
  6. 12. all the individuals of one kind in a specified area at one time
  7. 13. a scientist who studies fossils
  8. 18. a vertebrate with four limbs
  9. 19. a fossil made from parts of an organism such as bones or teeth
  10. 22. pieces of weathered rock such as sand, deposited by wind, water, and ice
  11. 26. selective breeding of organism's with human interference to produce desired traits (think of show dogs)
  12. 28. a diagram based on shared characteristics
  13. 29. the passing on of genetic traits from parents to offspring
  14. 32. the process by which the individuals best adapted to their environment tend to survive and pass down their traits to subsequent generations
  15. 34. a rock that preserves evidence such as animal tracks or impressions
  16. 37. the process of one species developing into two or more species that can no longer mate