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Incomplete
Dominance
· In cases of incomplete dominance,
neither allele dominates and the
heterozygote is intermediate in
phenotype between the two
homozygotes.
· In crosses involving incomplete
dominance, the genotype and
phenotype ratios are identical.
· Examples of incomplete dominance
include flower color in snapdragons
(right) and sweet peas, where red
and white flowered plants cross to
Cw Cw CRCw CRCR
produce pink flowered plants.…read more

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Flower Colour in Snapdragons
· Flower colour in snapdragons exhibits incomplete dominance,
with red flowered and white flowered plants crossing to produce
offspring with pink flowers.
Red flower White flower
Parents
CRCR
X CWCW
Gametes
CR CR CW CW
Possible
fertilizations
F1 offspring
CRCW CRCW CRCW CRCW
Pink Pink Pink Pink…read more

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Codominance
· In cases of codominance, both alleles are independently and equally
expressed in the heterozygote. Examples include:
· Roan (stippled red and white) coat color in cattle. A cross between a red bull
and a white cow produces all roan offspring.
· ABO human blood groups.
Red bull White cow
Parents CRCR CWCW
X
Gametes CR CR CW CW
Possible
fertilizations
CRCW CRCW CRCW CRCW
F1 offspring
Roan Roan Roan Roan…read more

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Worked examples
Roan Bull with a Roan cow Red bull with a Roan cow white bull with a Roan cow…read more

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