GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A breed of chicken shows codominance for feather color. One allele codes for black feathers, another codes for white feathers. The feathers of heterozygous chickens of this breed will be:
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all black
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all white
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all gray
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speckled black and white
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Explanation:
Detailed explanation-1: -Answer: “both black and white".
Detailed explanation-2: -Gray: 100% Cross a BLACK chicken (BB) with a WHITE chicken (WW). These alleles show INCOMPLETE DOMINANCE.
Detailed explanation-3: -In chickens, the allele for black feathers is co-dominant with the allele for white feathers.
Detailed explanation-4: -In chickens, coat color is a CODOMINANT trait, where black (B) and white (W) feathers are BOTH expressed. Individuals that have both alleles are speckled.
Detailed explanation-5: -Codominance: In some breeds of chickens, black feathers and white feathers are both dominant genes and heterozygous individuals appear checkered with black and white feathers.
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