HEREDITY
INCOMPLETE DOMINANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In Andalusian fowls, black individuals (BB) and white individuals (WW) are homozygous. Heterozygous individuals are black and white (BW).What is the genotype ratio for a cross between a black and white fowl and a white fowl? (make a punnett square)
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2 BB:2 BW:0 BB
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0 BB:4 BW:0 WW
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2 BW:2 WW:0 BB
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1 BB:2 BW:1 BB
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Explanation:
Detailed explanation-1: -The cross is made between the black and white feathers of the fowls in this breed of the Andalusian fowl. The blue feathered fowl is the product obtained from the cross.
Detailed explanation-2: -Andalusian fowls have two pure forms black and white, If black forms (BB) and white forms (WW) are crossed, F1 individuals appear blue coloured (BW), due to incomplete dominance.
Detailed explanation-3: -In Andalusian fowl, the gene for black plumage (AB) is codominant to the gene for white plumage (AW). The heterozygous genotype results in expression of the black and white feathers and is referred to as blue plumange. 2. Cross a fowl with black plumage with a fowl with blue plumage.
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