Incomplete Dominance
(Co-Dominance)

• Incomplete Dominance occurs where both genes/alleles are incompletely expressed in the phenotype.
• Example - 4 O'Clock Flowering Plants

GENOTYPE	PHENOTYPE
RR	Red flowers
WW	White flowers
RW	Pink flowers

If a red-flowering plant produced pollen that fertilised a white-flowering plant's egg, the possible offspring would be...

	R	R
W	RW	RW
W	RW	RW

Possible genotypes = all RW
Possible phenotypes = all pink-flowering plants