Why is it not enough to depend only on the visible form of a tall plant to know its exact genetic combination?
Answer and explanation
Correct answer: Because the tall form can appear in both pure and hybrid conditions
The governing concept is the difference between phenotype and genotype. If T is dominant, both TT (pure tall) and Tt (hybrid tall) plants show the same tall phenotype. The visible appearance therefore cannot reveal whether the plant carries one or two dominant alleles. A test cross with a recessive tt plant can help identify the unknown genotype. Option A is correct; the other statements wrongly deny genes, confuse inherited and acquired traits, or reverse dominance.
Frequently asked questions
What is the correct answer to this question?
Because the tall form can appear in both pure and hybrid conditions
Why is this the correct answer?
The governing concept is the difference between phenotype and genotype. If T is dominant, both TT (pure tall) and Tt (hybrid tall) plants show the same tall phenotype. The visible appearance therefore cannot reveal whether the plant carries one or two dominant alleles. A test cross with a recessive tt plant can help identify the unknown genotype. Option A is correct; the other statements wrongly deny genes, confuse inherited and acquired traits, or reverse dominance.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Control and Coordination. Topic: Plant hormones.
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