Which of the following statements is wrong about Drosophila melanogaster males

Question

BlackTom AI · Accepted Answer

Question focus: which statement is incorrect about male Drosophila melanogaster?
Option 1: 'males have a sex comb on the front pair of legs' — This is a well-known characteristic of male Drosophila. The sex comb is a specialized structure present on the forelegs of males and is commonly used as a diagnostic trait for sexing these flies. This statement is true.
Option 2: 'males are usually smaller than females' — Sexual dimorphism in Drosophila shows females generally larger than males. While there can be overlap in body size due to environment or strain, the general trend is that males are smaller. This statement is true in the typical sense.
Option 3: 'males are black at the end of the abdomen' — Male Drosophila often have a darker (black) posterior abdomen, whereas females tend to have a lighter, more uniform coloration. This description aligns with common observations and is true.
Option 4: 'males need longer to develop than females' — Development time from egg to adult is broadly similar between the sexes, with no consistent evidence that males require more time than females; if anything, differences, when present, are small and not a defining trait. This statement is not generally correct and thus is the incorrect option.
Summarizing the reasoning: Options 1, 2, and 3 describe established, observable male traits or typical sexual dimorphism in Drosophila melanogaster. The claim in option 4 about longer development time for males contradicts the usual understanding that development duration is similar across sexes, making it the false statement.

Which of the following statements is wrong about Drosophila melanogaster males单项选择题

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