MHT CET · BIOLOGY · STD 12 - 3. Inheritance and Variation

With reference to the Mendelian experiments, which one of the following statements is INCORRECT?

A A factor has only one allele.
B Recessive allele is not expressed in the presence of an alternative allele.
C The alleles accupy identical loci on homologous chromosomes.
D Allele is an alternative form of a given gene.

Verified Solution

Answer & Solution

Correct Answer

(A) A factor has only one allele.

Step-by-step Solution

Detailed explanation

In a diploid individual, a factor (gene) can have only two alleles, but in a population a factor can have multiple alleles.

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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