If a tall pea plant is crossed with a dwarf pea plant and all plants in the first generation are tall what can be concluded?
Answer and explanation
Correct answer: Tallness is the dominant trait
In a Mendelian cross, a dominant allele expresses its trait in a heterozygous offspring, whereas a recessive allele can remain masked. If a tall plant is crossed with a dwarf plant and every F₁ offspring is tall, the observed phenotype indicates that tallness is dominant under the usual pure-parent assumption. Dwarfness is therefore recessive, not destroyed. Options C and D contradict the observed F₁ result.
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What is the correct answer to this question?
Tallness is the dominant trait
Why is this the correct answer?
In a Mendelian cross, a dominant allele expresses its trait in a heterozygous offspring, whereas a recessive allele can remain masked. If a tall plant is crossed with a dwarf plant and every F₁ offspring is tall, the observed phenotype indicates that tallness is dominant under the usual pure-parent assumption. Dwarfness is therefore recessive, not destroyed. Options C and D contradict the observed F₁ result.
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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