Explore BrainMass

Explore BrainMass

    Epistasis, Pedigree Analysis and the Genetics of Sex

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    Outlines of types of epistasis are included.

    © BrainMass Inc. brainmass.com March 4, 2021, 5:37 pm ad1c9bdddf

    Solution Preview

    Sex chromosomes:

    A male needs only 1 copy of a recessive allele to display the phenotype. A female needs 2 copies. Therefore, males are more likely to display recessive traits.

    Ex. Sex-influenced traits


    AA > normal
    Aa > normal
    aa > bald


    AA > normal
    Aa > bald
    aa > bald

    Epistasis: interaction of different loci

    Ex. AA or Aa > round
    aa > wrinkled
    BB or Bb > yellow
    bb > green

    If you cross: AaBb * AaBb

    9 AABB or AABb or AaBB or AaBb (round, yellow)
    3 AAbb or Aabb (round, green)
    3 aaBB or aaBb (wrinkled, ...

    Solution Summary

    Epistasis, Pedigree Analysis and the Genetics of Sex are noted.