Unit 1 Words

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