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Incomplete Dominance

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Mendel s experiments only looked at traits in which only one of the alleles is expressed COMPLETE DOMINANCE F1 x F1 Second Generation (F2) Homozygous dominant ... – PowerPoint PPT presentation

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Title: Incomplete Dominance


1
Incomplete Dominance
Codominance
2
  • Mendels experiments only looked at traits in
    which only one of the alleles is expressed

COMPLETE DOMINANCE
3
P
p
F1 x F1
P
P
P
P
p
Second Generation (F2)
P
p
p
pp
Homozygous dominant purple
Homozygous recessive white
Heterozygous lavender
Incomplete Dominance
4
  • Mendels experiments only looked at traits in
    which only one of the alleles is expressed

COMPLETE DOMINANCE
a situation where neither allele dominates the
other and both exercise an influence on the
individual results in partial expression of both
traits.
Incomplete dominance
5
P
p
F1 x F1
P
P
P
P
p
Second Generation (F2)
P
p
p
pp
Homozygous dominant purple
Homozygous recessive white
Heterozygous purple and white speckled
Codominance
6
  • Mendels experiments only looked at traits in
    which only one of the alleles is expressed

COMPLETE DOMINANCE
a situation where neither allele dominates the
other and both exercise an influence on the
individual results in partial expression of both
traits.
Incomplete dominance
Codominance
A situation where both alleles are expressed
fully to produce offspring with a third phenotype
7
Red (dominant)
Roan
White (recessive)
Codominance
8
Incomplete Dominance
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