Unit 3 Crossword

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Across
  1. 4. expressed outward appearance of a trait
  2. 8. having 2 different alleles for a trait
  3. 10. new combination of gametes produced by crossing over and independent assortment
  4. 12. having more than 2 alleles for a specific trait
  5. 13. alternative form of a gene
  6. 14. the study of heredity
  7. 15. one of the pyrimidines of DNA
  8. 17. trait that is controlled by genes on the X chromosome
  9. 18. directed breeding
  10. 20. having multiple sets of chromosomes
  11. 21. individual that is heterozygous for a recessive disorder and carries the gene for the trait
Down
  1. 1. two alleles separate during meiosis
  2. 2. law when two alleles randomly distribute during the formation of gametes
  3. 3. having 2 of the same alleles for a trait
  4. 5. name for trait that appears in F2 generation
  5. 6. diagrammed family history of generational inheritance
  6. 7. name for trait that appears in F1 generation
  7. 9. occurs when neither allele is dominant and both phenotypes are expressed
  8. 11. cross that can be used to determine an organism's genotype
  9. 14. an organism's allele pairs (letters)
  10. 16. selective breeding of closely related organisms
  11. 17. disease where red blood cells are shaped like sickles
  12. 19. one of the purines of DNA