Single gene disorders - Incomplete dominance
In some instances of inheritance, the An allele that always expresses itself whether it is partnered by a recessive allele or by another like itself. allele may not fully express itself. This is known as incomplete dominance.
Both incomplete dominance alleles are shown with upper case letters in genetic diagrams, but the letters used are different. For example, feather colour in hens may be white, black or speckled (it has both white feathers and black feathers). The alleles can be shown as W for white and B for black.
There are three possible The alleles that an organism has for a particular characteristic, usually written as letters.: WW, BB and BW.
There are also three possible phenotypes: WW = white, BB = black, and BW = speckled.
incomplete dominance in chickens