When can a recessive trait appear?
Answer and explanation
Correct answer: When both copies of it are present
The governing concept is recessive inheritance. A recessive allele is usually masked when a dominant allele is present in a heterozygous individual. It is expressed when an individual receives the recessive allele from both parents, producing a homozygous recessive condition. Thus option A is correct, with “both copies” referring to the two recessive alleles. A dominant allele does not reveal the recessive phenotype, and fossils or absence of reproductive cells are irrelevant.
Frequently asked questions
What is the correct answer to this question?
When both copies of it are present
Why is this the correct answer?
The governing concept is recessive inheritance. A recessive allele is usually masked when a dominant allele is present in a heterozygous individual. It is expressed when an individual receives the recessive allele from both parents, producing a homozygous recessive condition. Thus option A is correct, with “both copies” referring to the two recessive alleles. A dominant allele does not reveal the recessive phenotype, and fossils or absence of reproductive cells are irrelevant.
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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