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:

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: (A) 50 % white: 50 % blue (B) 50 % black: 50 % blue (C) 50 % black: 50 % white (D) 25 % black: 25 % blue: 50 % white

Tardigrade Admin · 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.

Q. 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:

50 % white : 50 % blue

50 % black : 50 % blue

50 % black : 50 % white

25 % black : 25 % blue : 50 % white

Q. 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:

50 % white : 50 % blue

50 % black : 50 % blue

50 % black : 50 % white

25 % black : 25 % blue : 50 % white

Q. 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: