Unit 8/Life Science Test Review

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Across
  1. 1. an organism that has two different alleles for a trait
  2. 4. an organism that has two identical alleles for a trait
  3. 6. Cell division that produces reproductive cells with a set of single chromosomes
  4. 7. A complex molecule containing the genetic information that makes up the chromosomes.
  5. 11. A cell structure that controls which substances can enter or leave both plant and animal cells
  6. 14. a segment of DNA on a chromosome that codes for a specific trait
  7. 16. idea that all living things are composed of cells, and that new cells are produced from existing cells
  8. 17. A rigid layer of nonliving material that surrounds the cells of plants
  9. 19. different forms of a physical characteristic
  10. 20. describes a trait that covers over, or dominates, another form of that trait.
  11. 21. how a trait appears based on the inherited combination of alleles
  12. 22. a number that describes how likely it is that an event will occur, often expressed as a percentage
  13. 23. product of reproduction, a new organism produced by one or more parents
  14. 25. a chart that shows all the possible combinations of alleles that can result from a genetic cross
  15. 26. different forms of a gene that codes for a trait
  16. 27. A part of the cell containing DNA and responsible for growth and reproduction
Down
  1. 2. a cell resulting from the fusion of two reproductive cells; a fertilized egg
  2. 3. threadlike structures made of DNA molecules
  3. 5. A reproductive process that involves two parents that combine their genetic material to produce a new organism, which differs from both parents
  4. 8. the passing of traits from parents to offspring
  5. 9. series of events that cells go through as they grow and divide
  6. 10. A reproductive process that involves only one parent and produces offspring that are identical to the parent.
  7. 12. trait of an organism that can be masked by the dominant form of a trait
  8. 13. Process in sexual reproduction in which male and female reproductive cells join to form a new cell
  9. 15. an organism's genetic makeup, or allele combination
  10. 18. cell division which creates cells each containing the same number of chromosome pairs
  11. 24. specialized cell involved in sexual reproduction