Question

According to the concept of dominance, the modified allele is equivalent to the unmodified allele when?

• A. It produces normal/less efficient enzyme
• B. It produces the same phenotype/trait
• C. It results in the transformation of substrate
• D. More than one option is correct

Answer 1

The correct option is A It produces normal/less efficient enzyme

A gene is responsible for the appearance of a specific trait. In diploid organisms, a gene is represented by a pair of alleles. When these two alleles are not identical, one of alleles is different with modified information. Normal allele will form normal enzyme. Changed or modified allele can form three types of enzymes i.e. normal enzyme, non-functional enzyme, no enzyme at all. Enzyme is always required for the formation of substrate say ‘S’. Modified allele is almost similar to normal allele and forms the same enzyme and produces same phenotypic trait i.e., leads to the formation of substrate ‘S’. But sometimes allele formed are non­functional enzyme or no enzyme and phenotypic trait depends on functioning of un-modified allele. Functioning or unmodified allele will form the original normal phenotypic trait (due to dominant allele) and modified allele will be known as recessive allele.

So the correct option is 'it produces normal/less efficient enzyme'.