An Andalusian fowl, with the heterozygous condition of alleles for black plumage B and white b is blue coloured. A blue Andalusian fowl is bred to a black Andulasian fowl, the proportion of the offspr

Question

An Andalusian fowl, with the heterozygous condition of alleles for black plumage B and white b is blue coloured. A blue Andalusian fowl is bred to a black Andulasian fowl, the proportion of the offspring will be:

TestHub · Accepted Answer

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-

	B	B
B	BB (Black)	BB (Black)
b	Bb (Blue)	Bb (Blue)

Genotype of $F_{1}$ - BB and Bb $1 : 1$
Phenotype of $F_{1}$ - Black and Blue $1 : 1$ 50% black and 50% blue.

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