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In an experiment, scientists changed a single gene in cloned flies of a certain species. These cloned flies lacked the eye cells that give flies ultraviolet vision, even though cloned siblings with unaltered, otherwise identical genes had normal vision. Thus, scientists have shown that flies of this species lacking ultraviolet vision must have some damage to this gene.

Which one of the following is an assumption required by the argument?

(A) The relationship between genes and vision in flies is well understood. Incorrect

cant be an assumption

(B) No other gene in the flies in the experiment is required for the formation of the ultraviolet vision cells. Incorrect

but lacking ultraviolet vision can be for some other side effects occurred by the changes in gene

(C) Ultraviolet vision is a trait found in all species of flies. Incorrect

additional info

(D) The gene change had no effect on the flies other than the lack of ultraviolet vision cells. Correct

so, the gene change is the only reason for lacking ultraviolet vision

(E) Ultraviolet vision is an environmentally influenced trait in the species of flies in the experiment. Incorrect

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Hello from the GMAT Club VerbalBot!

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