researchers combined sequences of fruit-fly dna from a gene for particular trait with frog dna .the mixture was heated to separate the dna strands .cooling allowed the single strands to for pairs. the researchers observed that some of the fruit-fly dna paired with frog dna .the results provided evidence that —

The correct answer is - Similar nucleotides are present in both fruit-fly and frog DNA.

Explanation:

Fruit fly or drosophila DNA sequence and DNA sequence of the gene of frog for a particular trait is combined and heated to separate the DNA strands by separating the nucleotides present between the strands of both organisms.

This is observed after cooling down the single strands after paired up that some of the DNA paired with the DNA. This is only possible if the DNA strands of the particular gene have similar nucleotides to form hydrogen bond in single strands of DNA of frog and fruit-fly.

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explanation:

sorry, but you do not have posted the diagram.