If a pea plant is dwarf, what is the most correct genetic conclusion about it?
Answer and explanation
Correct answer: It has both recessive copies
The governing concept is recessive inheritance. Represent the tall allele by T and the dwarf allele by t. Since T masks t in a heterozygous Tt plant, a plant can show dwarfness only when it lacks a dominant T allele. Its genotype must therefore be tt, meaning that it has received a recessive copy from each parent. Option B is correct. A dominant copy would produce tallness, while the other choices deny the genetic basis of the trait.
Frequently asked questions
What is the correct answer to this question?
It has both recessive copies
Why is this the correct answer?
The governing concept is recessive inheritance. Represent the tall allele by T and the dwarf allele by t. Since T masks t in a heterozygous Tt plant, a plant can show dwarfness only when it lacks a dominant T allele. Its genotype must therefore be tt, meaning that it has received a recessive copy from each parent. Option B is correct. A dominant copy would produce tallness, while the other choices deny the genetic basis of the trait.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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