NEET BIOLOGY

Detailed explanation-1: -Here, the correct answer is (2) Non-functional enzyme.

Detailed explanation-2: -<br> Reason :-The modified allele could be responsible for production of a non functional enzyme or no enzyme at al. Assertion :-The unmodified allele, which represents the orginal phenotype is the dominant allele and the modified allele is generally the recessive allele.

Detailed explanation-3: -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.

Detailed explanation-4: -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 allele. 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.

Detailed explanation-5: -One of them may be different due to some changes that it has undergone which modifies the information that particular allele contains. In the first case, the modified allele is equivalent to the unmodified allele, i.e. it will produce the same phenotype/trait i.e. result in the transformation of substrate S.