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In which case will the heterozygous individual (Aa) have a phenotype different from the homozygous dominant individual (aa)?
- a)When the alleles do not show a dominant-recessive relationship.
- b)When one allele is incompletely dominant over the other.
- c)When the gene shows recessive epistasis
- d)When the two alleles are co-dominant
Correct answer is option 'A,B,D'. Can you explain this answer?
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Verified Answer
In which case will the heterozygous individual (Aa) have a phenotype d...
When alleles show a dominant recessive relationship, then the heterozygous and homozygous dominant genotypes show same phenotype. When alleles are co-dominant or incompletely dominant, the heterozygous individuals show different phenotypes such as in ABO blood groups and Antirrhinum flowers.
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In which case will the heterozygous individual (Aa) have a phenotype d...
Explanation:
In the given question, we are comparing the phenotype of a heterozygous individual (Aa) with a homozygous dominant individual (aa). Let's analyze each option individually to understand why these scenarios would result in a different phenotype.
A) When the alleles do not show a dominant-recessive relationship:
In a dominant-recessive relationship, the dominant allele masks the expression of the recessive allele, resulting in the same phenotype for both heterozygous (Aa) and homozygous dominant (aa) individuals. However, if the alleles do not show a dominant-recessive relationship, both alleles may contribute to the phenotype, leading to a different phenotype in the heterozygous individual compared to the homozygous dominant individual.
B) When one allele is incompletely dominant over the other:
In incomplete dominance, neither allele is dominant over the other, and as a result, the heterozygous individual exhibits a phenotype that is intermediate between the phenotypes of the two homozygous individuals. This results in a different phenotype for the heterozygous individual in comparison to the homozygous dominant individual.
D) When the two alleles are co-dominant:
In co-dominance, both alleles are expressed simultaneously without one allele being dominant over the other. This results in a phenotype that exhibits the traits of both alleles equally. Therefore, the heterozygous individual will have a phenotype that is different from the homozygous dominant individual.
Conclusion:
In summary, the heterozygous individual (Aa) will have a different phenotype from the homozygous dominant individual (aa) when:
- The alleles do not show a dominant-recessive relationship.
- One allele is incompletely dominant over the other.
- The two alleles are co-dominant.
These scenarios lead to different phenotypes because in each case, the expression of the alleles is not solely determined by the dominant allele, resulting in a different phenotype for the heterozygous individual.
In the given question, we are comparing the phenotype of a heterozygous individual (Aa) with a homozygous dominant individual (aa). Let's analyze each option individually to understand why these scenarios would result in a different phenotype.
A) When the alleles do not show a dominant-recessive relationship:
In a dominant-recessive relationship, the dominant allele masks the expression of the recessive allele, resulting in the same phenotype for both heterozygous (Aa) and homozygous dominant (aa) individuals. However, if the alleles do not show a dominant-recessive relationship, both alleles may contribute to the phenotype, leading to a different phenotype in the heterozygous individual compared to the homozygous dominant individual.
B) When one allele is incompletely dominant over the other:
In incomplete dominance, neither allele is dominant over the other, and as a result, the heterozygous individual exhibits a phenotype that is intermediate between the phenotypes of the two homozygous individuals. This results in a different phenotype for the heterozygous individual in comparison to the homozygous dominant individual.
D) When the two alleles are co-dominant:
In co-dominance, both alleles are expressed simultaneously without one allele being dominant over the other. This results in a phenotype that exhibits the traits of both alleles equally. Therefore, the heterozygous individual will have a phenotype that is different from the homozygous dominant individual.
Conclusion:
In summary, the heterozygous individual (Aa) will have a different phenotype from the homozygous dominant individual (aa) when:
- The alleles do not show a dominant-recessive relationship.
- One allele is incompletely dominant over the other.
- The two alleles are co-dominant.
These scenarios lead to different phenotypes because in each case, the expression of the alleles is not solely determined by the dominant allele, resulting in a different phenotype for the heterozygous individual.
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In which case will the heterozygous individual (Aa) have a phenotype different from the homozygous dominant individual (aa)?a)When the alleles do not show a dominant-recessive relationship.b)When one allele is incompletely dominant over the other.c)When the gene shows recessive epistasisd)When the two alleles are co-dominantCorrect answer is option 'A,B,D'. Can you explain this answer?
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