NEET · Biology · STD 12 - 4. principal of inheritance and variation

Alleles are

A different molecular forms of a gene
B heterozygotes
C different phenotype
D true breeding homozygotes.

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Answer & Solution

Correct Answer

(A) different molecular forms of a gene

Step-by-step Solution

Detailed explanation

(a): Genes are the units of inheritance and contain the information that is required to express a particular trait in an organism. Alternating forms of a single gene which code for a pair of contrasting traits are known as alleles. For example, two alleles determine the height of pea plant (tall and dwarf).

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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