If a pea plant appears dwarf, what type of genetic information must it have?
Answer and explanation
Correct answer: Two recessive alleles
According to Mendel’s principle of dominance, a recessive phenotype appears only when both copies of the relevant gene are recessive. Using T for tallness and t for dwarfness, a dwarf pea plant must have the genotype tt. A Tt plant is tall because the dominant T masks t, while TT is also tall. Therefore option A is correct; the plant still has genes and chromosomes.
Frequently asked questions
What is the correct answer to this question?
Two recessive alleles
Why is this the correct answer?
According to Mendel’s principle of dominance, a recessive phenotype appears only when both copies of the relevant gene are recessive. Using T for tallness and t for dwarfness, a dwarf pea plant must have the genotype tt. A Tt plant is tall because the dominant T masks t, while TT is also tall. Therefore option A is correct; the plant still has genes and chromosomes.
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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