Question:
The genotype of a plant showing the dominant phenotype can be determined by
The genotype of a plant showing the dominant phenotype can be determined by
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A test cross is the standard method to distinguish homozygous dominant from heterozygous individuals showing the dominant trait.
Updated On: Jun 19, 2026
- Test cross
- Dihybrid cross
- Pedigree analysis
- Back cross
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The Correct Option is A
Solution and Explanation
Step 1: Understanding dominant phenotype.
A dominant phenotype may arise from either a homozygous dominant (AA) or heterozygous (Aa) genotype.
Step 2: Purpose of a test cross.
- A test cross involves crossing the individual with a homozygous recessive (aa) plant.
- The offspring phenotypes reveal the genotype of the parent.
Step 3: Interpretation of results.
- If all progeny show the dominant phenotype → parent is homozygous dominant.
- If progeny show a 1:1 ratio of dominant to recessive → parent is heterozygous.
Step 4: Comparison with other options.
- Dihybrid cross: analyzes inheritance of two traits simultaneously.
- Pedigree analysis: traces inheritance in family trees.
- Back cross: crossing hybrid with parent or genetically similar individual, not specifically for dominant genotype detection.
Step 5: Conclusion.
Hence, a test cross determines the genotype of a plant showing dominant phenotype.
A dominant phenotype may arise from either a homozygous dominant (AA) or heterozygous (Aa) genotype.
Step 2: Purpose of a test cross.
- A test cross involves crossing the individual with a homozygous recessive (aa) plant.
- The offspring phenotypes reveal the genotype of the parent.
Step 3: Interpretation of results.
- If all progeny show the dominant phenotype → parent is homozygous dominant.
- If progeny show a 1:1 ratio of dominant to recessive → parent is heterozygous.
Step 4: Comparison with other options.
- Dihybrid cross: analyzes inheritance of two traits simultaneously.
- Pedigree analysis: traces inheritance in family trees.
- Back cross: crossing hybrid with parent or genetically similar individual, not specifically for dominant genotype detection.
Step 5: Conclusion.
Hence, a test cross determines the genotype of a plant showing dominant phenotype.
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