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

How many of the following genotypes possibly represent normal wings in Drosophila?
(i) \(Vg ^{+} Vg ^{+}\)
(ii) \(Vg ^{+} v g n i\)
(iii) \(Vg ^{+}\)vgno
(iv)\(Vg ^{+} vgst\)
(v)\(Vg ^{+} vg\)

A (i), (ii) and (iii) only
B (i) and (ii) only
C Only (i)
D (i), (ii), (iii), (iv) and (v)

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Answer & Solution

Correct Answer

(D) (i), (ii), (iii), (iv) and (v)

Step-by-step Solution

Detailed explanation

All types represent the normal wings of Drosophila. Multiple alleles are more than two alternative forms of a gene in a population occupying the same locus on a chromosome or its homologue. A gene can mutate several times to produce a series of alternative expressions but wild type is dominant over all mutants.

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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How many of the following genotypes possibly represent normal wings in Drosophila?(i) \(Vg ^{+} Vg ^{+}\)(ii) \(Vg ^{+} v g n i\)(iii) \(Vg ^{+}\)vgno(iv)\(Vg ^{+} vgst\)(v)\(Vg ^{+} vg\)

Step-by-step Solution

How many of the following genotypes possibly represent normal wings in Drosophila?
(i) \(Vg ^{+} Vg ^{+}\)
(ii) \(Vg ^{+} v g n i\)
(iii) \(Vg ^{+}\)vgno
(iv)\(Vg ^{+} vgst\)
(v)\(Vg ^{+} vg\)