Epistasis, Pedigree Analysis and the Genetics of Sex
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Outlines of types of epistasis are included.
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Solution Summary
Epistasis, Pedigree Analysis and the Genetics of Sex are noted.
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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
Females:
AA > normal
Aa > normal
aa > bald
Males:
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, ...
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