Which of the following statements is true?
(a) The intron structure of most genes is conserved among vertebrates.
(b) The more nucleotides there are in an organism's genome, the more genes there will be in its genome.
(c) Because the fly Drosophila melanogaster and humans diverged from a common ancestor so long ago, a gene in the fly will show more similarity to another gene from the same species than it will to a human gene.
(d) An organism from the same Order as another will be more likely to have a genome of the same size than will a more evolutionarily diverged animal.
Choice (a) is correct. There is no necessary correlation between genome size and gene number [choice (b)]. There are some fly genes, particularly those with a conserved function, that show much greater similarity to human genes than to another fly gene [choice (c)]. Genome size does not necessarily correlate with evolutionary relatedness [choice (d)].
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