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Assertion: The presence of a Y chromosome is not required for male development in Drosophila.

Reason: The sex of Drosophila is determined by the X:A ratio, and not by the presence of a Y chromosome.

Option: 1

Assertion and reason are both true, and reason is an accurate account of assertion.


Option: 2

Both assertion and reason are accurate, but reason does not adequately explain assertion.


Option: 3

The assertion is correct, but the reasoning is incorrect.


Option: 4

Both the assertion and reason are incorrect.


Answers (1)

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 In Drosophila, the sex of an individual is determined by the X:A ratio, where males have one X chromosome and two sets of autosomes, while females have two X chromosomes and two sets of autosomes. Unlike in many other organisms, the presence of a Y chromosome is not required for male development in Drosophila. Therefore, Drosophila males do not have a Y chromosome. Instead, the X:A ratio determines the sexual fate of the fly. This mechanism is known as X-linked sex determination, and it ensures that males and females are produced in a precise ratio. Mutations in genes involved in the X-linked sex determination pathway can lead to disorders of sex development in flies, just as they can in humans.

Option 1 is the correct answer.

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