Why did the dwarf trait not appear in the first generation of Mendel’s pure tall and pure dwarf cross?
Answer and explanation
Correct answer: The dominant tall trait masked the recessive dwarf trait.
Let the dominant tall allele be T and the recessive dwarf allele be t. A pure tall parent is TT and a pure dwarf parent is tt. Every F1 offspring receives T from the first parent and t from the second, giving genotype Tt. Because T is dominant, all F1 plants appear tall, while the t allele remains present but hidden. Therefore option A is correct; the dwarf information was not destroyed or absent.
Frequently asked questions
What is the correct answer to this question?
The dominant tall trait masked the recessive dwarf trait.
Why is this the correct answer?
Let the dominant tall allele be T and the recessive dwarf allele be t. A pure tall parent is TT and a pure dwarf parent is tt. Every F1 offspring receives T from the first parent and t from the second, giving genotype Tt. Because T is dominant, all F1 plants appear tall, while the t allele remains present but hidden. Therefore option A is correct; the dwarf information was not destroyed or absent.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Heredity and Evolution. Topic: Mendel’s laws.
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