Question:
Suppose, a white-furred rabbit breed is crossed with a black-furred rabbit breed and produces gray fur offsprings. What does the gene for fur color in rabbits appear to be an example of
Suppose, a white-furred rabbit breed is crossed with a black-furred rabbit breed and produces gray fur offsprings. What does the gene for fur color in rabbits appear to be an example of
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- Blending/Intermediate phenotype (Black x White = Gray) \(\implies\) Incomplete Dominance.
- Both traits expressed together without blending (Black x White = Black and White spots) \(\implies\) Codominance.
- Both traits expressed together without blending (Black x White = Black and White spots) \(\implies\) Codominance.
Updated On: Jul 24, 2026
- Mosaicism
- Codominance
- Incomplete dominance
- Complete dominance
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
In classical Mendelian genetics, complete dominance occurs when the dominant allele completely masks the expression of the recessive allele in the heterozygous state.
However, several non-Mendelian inheritance patterns exist, including incomplete dominance and codominance, where both alleles influence the heterozygous phenotype.
Step 2: Detailed Explanation:
Let us analyze the differences between these genetic inheritance patterns:
- Incomplete dominance: This occurs when the heterozygous genotype exhibits a phenotype that is a physical blend or intermediate expression of the two homozygous phenotypes.
In this case, crossing a homozygous white-furred parent (\( WW \)) with a homozygous black-furred parent (\( BB \)) produces heterozygous offspring (\( WB \)) with gray fur.
Because gray is an intermediate color between black and white, this is a classic example of incomplete dominance.
- Codominance: This occurs when both alleles are expressed simultaneously and fully in the heterozygote without blending.
If fur color followed codominance, the offspring would have patches of both black and white fur (a spotted pattern) rather than a uniform gray color.
- Complete dominance: If black were completely dominant over white, the offspring would have solid black fur.
- Mosaicism: This refers to the presence of two or more genetically distinct cell lines in an individual derived from a single zygote, which is not applicable here.
Therefore, the production of gray offspring from a black and white cross is an example of incomplete dominance.
Step 3: Final Answer:
The gene for fur color in these rabbits appears to be an example of incomplete dominance.
In classical Mendelian genetics, complete dominance occurs when the dominant allele completely masks the expression of the recessive allele in the heterozygous state.
However, several non-Mendelian inheritance patterns exist, including incomplete dominance and codominance, where both alleles influence the heterozygous phenotype.
Step 2: Detailed Explanation:
Let us analyze the differences between these genetic inheritance patterns:
- Incomplete dominance: This occurs when the heterozygous genotype exhibits a phenotype that is a physical blend or intermediate expression of the two homozygous phenotypes.
In this case, crossing a homozygous white-furred parent (\( WW \)) with a homozygous black-furred parent (\( BB \)) produces heterozygous offspring (\( WB \)) with gray fur.
Because gray is an intermediate color between black and white, this is a classic example of incomplete dominance.
- Codominance: This occurs when both alleles are expressed simultaneously and fully in the heterozygote without blending.
If fur color followed codominance, the offspring would have patches of both black and white fur (a spotted pattern) rather than a uniform gray color.
- Complete dominance: If black were completely dominant over white, the offspring would have solid black fur.
- Mosaicism: This refers to the presence of two or more genetically distinct cell lines in an individual derived from a single zygote, which is not applicable here.
Therefore, the production of gray offspring from a black and white cross is an example of incomplete dominance.
Step 3: Final Answer:
The gene for fur color in these rabbits appears to be an example of incomplete dominance.
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