If a pea plant appears dwarf, what conclusion about its trait information is correct?
Answer and explanation
Correct answer: It must carry two recessive alleles for dwarfness.
In the Mendelian pea example, tallness is dominant and dwarfness is recessive. A dominant allele would mask a recessive dwarf allele in a heterozygous plant, so a plant showing the dwarf phenotype cannot contain a dominant tall allele for that trait. Its genotype must therefore be tt, with two recessive alleles. Option A is correct; genes are present, and the phenotype is not explained as merely an acquired change.
Frequently asked questions
What is the correct answer to this question?
It must carry two recessive alleles for dwarfness.
Why is this the correct answer?
In the Mendelian pea example, tallness is dominant and dwarfness is recessive. A dominant allele would mask a recessive dwarf allele in a heterozygous plant, so a plant showing the dwarf phenotype cannot contain a dominant tall allele for that trait. Its genotype must therefore be tt, with two recessive alleles. Option A is correct; genes are present, and the phenotype is not explained as merely an acquired change.
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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