– there is an interaction between 2 alleles in the homozygous form
– alleles are semi – or incompletely dominant and act together to yield an intermediate heterozygote – usually phenotypically between the two homozygote
– when definite product or substance controlled by each allele is identified
ex. of incomplete dominance:
Andalusian Fowl – has gene that determines feather colour
2 blue feathers (Bb) – give following offspring:
1 black (BB)
2 blue (Bb)
1 white with black splashes (bb)
Black (BB) X white (bb) = all blue (Bb)
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