Biology: Sex chromosomes/inherited

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Biology: Sex chromosomes/inherited
2011-03-16 15:46:46
Biology Sex chromosomes inherited

Biology: Sex chromosomes/inherited
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  1. sex chromosomes
    determines whether the offsprings are male or female.
  2. autosomes
    non-sex chromosomes
  3. sex linkage genes
    X-linked and Y-linked genes together
  4. Sex-limited traits
    expressed in the presenece of sex hormones and are only observed in one sex or the other.
  5. sex influenced traits
    expressed in both sexes, but are expressed differently.

    ex: baldness
  6. trait
    variation of a particular inherited character
  7. genetics
    study of heredity
  8. 2 types of Intermediate inheritance
    • -Incomplete Dominance
    • -Codominance
  9. Incomplete Dominance
    Both alleles are partially expressed.

    example: Blending
  10. Codominance
    Shows a phenotype that is a mixture of both parents. Both alleles are shown.

    example: roan cows.
  11. Polygenic Trait
    • many genes.
    • 1 trait

    example: height, eye color, skin color, weight.
  12. how are eye colors determined by 3 genes?
    • gene 1: TONE of pigment
    • gene 2: AMOUNT of pigment
    • gene 3: POSITION of the pigment
  13. Pleiotropy
    • 1 gene
    • affecting multiple traits

    example: sickle cell disease