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An Andalusian fowl, with the heterozygous condition of alleles for black plumage and white is blue coloured. A blue Andalusian fowl is bred to a black Andulasian fowl, the proportion of the offspring will be:
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50 % black : 50 % blue
Incomplete dominance is a deviation of Mendels law of dominance where the heterozygous individual instead of expressing the dominant trait, it expresses a trait which is a mix of the parent traits. On crossing, black form fowl with white form fowl, the offspring is blue form.
When a black form fowl is crossed with blue form fowl we get-
Genotype of - BB and Bb
Phenotype of - Black and Blue 50% black and 50% blue.
When a black form fowl is crossed with blue form fowl we get-
| B | B | |
| B | BB (Black) | BB (Black) |
| b | Bb (Blue) | Bb (Blue) |
Genotype of - BB and Bb
Phenotype of - Black and Blue 50% black and 50% blue.
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