Bio Sat2 ch.6

  1. Phenotype
    • The physically expressed form of a trait.
    • Ie. white fur, for the trait fur color
  2. Genotype
    • The genes that make up the organisms trait.
    • Ie. Ww for fur color
  3. Dominant
    Am allele that will always be expressed if present
  4. Recessive
    An alelle that will only be expressed if it is the only alelle.
  5. allele
    An allele is a gene that has more than vversion of the same trait.
  6. Homozygous
    • An organism with two of the same alelles for a trait.
    • Ie. AA or aa
  7. Heterozygous
    • An organism with two different alelles for a trait.
    • Ie. Aa
  8. Codominance
    • When, in a heterozygote, both alelles are exspressed.
    • Ie. AB blood type.
  9. Test cross
    Testing to see the possible outcomes for offspring.
  10. Punett square
    A way to test to see possible outcomes for offspring
  11. Dihybird Cross
    • A cross between two organisms that differ in two characteristics.
    • Ie. RrYy +RrYy
  12. Mendelian Genetics
    Refering to Gregor Mendel, "the father of genetics".
  13. Sex chromosomes
    • X and Y chromosomes.
    • the 23rd pair
  14. Autosomes
    Somatic chromosomes. (non-sex)
  15. Sex-linked trait
    A trait on the X or Y chromosome
  16. X-linked
    • A trait on the X chromosome.
    • Need to know:
    • Hemophilia
    • color blindness
    • male pattern baldness
  17. Hemophilia
    • Body dosn't produce blood clotting agent, or not enough.
    • X-linked recessive trait.
  18. X-linked recessive trait
    • A recessive trait on the X chromosome.
    • More common to show up in Males, because they only have one X.
  19. Carriers
    A female who has a X-linked recessive trait, but does not express it.
  20. color blindness
    X-linked recessive trait.
  21. Male pattern baldness
    X-linked recessive trait.
  22. Pedigree
    • A chart that shows a family, and a trait being passed through.
    • Shows the presence of a phenotype.
  23. Population genetics
    The study of an allele frequency distribution, and change as a result of migration, natural selection, genetic drift, or mutation.
Card Set
Bio Sat2 ch.6
Cracking Genetics