genetics

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Across
  1. 2. An organism’s genetic makeup (the actual letters, like Aa).
  2. 5. A segment of DNA that codes for a specific trait.
  3. 7. Having two identical alleles for a trait (e.g., TT or tt).
  4. 9. The "shape" of a DNA molecule: a double ____.
  5. 12. A permanent change in a DNA sequence.
  6. 13. The process by which DNA makes a copy of itself.
  7. 14. A genetic backup or "hidden" trait that only shows if two copies are present.
  8. 15. Different forms of a single gene.
Down
  1. 1. The molecule that carries genetic instructions for all living things.
  2. 3. The physical appearance of an organism (e.g., blue eyes).
  3. 4. The trait that "masks" another and always shows up if present.
  4. 6. Human cells typically have 23 pairs of these thread-like structures.
  5. 8. A diagram used to predict the probability of offspring genotypes.
  6. 10. The father of modern genetics.
  7. 11. Having two different alleles for a trait (e.g., Tt).