If a recessive trait is visible, what conclusion about its gene forms is correct?
Answer and explanation
Correct answer: Both gene forms will be recessive
The governing concept is dominance in a Mendelian genotype. A recessive phenotype appears only when the individual has two recessive alleles, commonly written aa. If one dominant allele, A, were present in Aa, it would usually mask the recessive allele and produce the dominant phenotype. Therefore option A is correct. Options B and C would normally produce a dominant appearance, while D is biologically impossible because a trait requires genetic information.
Frequently asked questions
What is the correct answer to this question?
Both gene forms will be recessive
Why is this the correct answer?
The governing concept is dominance in a Mendelian genotype. A recessive phenotype appears only when the individual has two recessive alleles, commonly written aa. If one dominant allele, A, were present in Aa, it would usually mask the recessive allele and produce the dominant phenotype. Therefore option A is correct. Options B and C would normally produce a dominant appearance, while D is biologically impossible because a trait requires genetic information.
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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