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2/11/09
Incomplete
Dominance
Incomplete
and
Co‐Dominance
•  When
2
types
of
alleles
that
are
equally
dominant
form
an
intermediate
or
“mixed”
phenotype
•  Example:
Four
o’Clock
Flowers
When
Dominant
and
Recessive
aren’t
what
they
appear
to
be!
Example: In flowers
White + Red = Pink
Incomplete
Dominance
Incomplete
Dominance
Co‐dominance
•  When
both
alleles
for
a
gene
are
expressed
in
the
heterozygous
offspring
•  Neither
is
dominant
or
recessive,
both
“show”
Example: In flowers
White + Red = White
& Red spots
1
2/11/09
Co‐dominance
Co‐dominance
Example: roan cattle or horses
Hybrid pink and white camellia; an example of co-dominance.
Picture taken in Japan.
2
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