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