In which condition will a recessive trait appear in the phenotype?
Answer and explanation
Correct answer: When both factors are recessive
For a trait controlled by a dominant and recessive allele, the dominant allele masks the recessive allele in a heterozygote. The recessive phenotype appears only when the individual receives a recessive allele from each parent, giving a homozygous recessive genotype such as aa. Therefore option B is correct. One recessive allele with a dominant allele produces the dominant phenotype, and the other alternatives do not describe a valid allele condition for expression.
Frequently asked questions
What is the correct answer to this question?
When both factors are recessive
Why is this the correct answer?
For a trait controlled by a dominant and recessive allele, the dominant allele masks the recessive allele in a heterozygote. The recessive phenotype appears only when the individual receives a recessive allele from each parent, giving a homozygous recessive genotype such as aa. Therefore option B is correct. One recessive allele with a dominant allele produces the dominant phenotype, and the other alternatives do not describe a valid allele condition for expression.
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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