58) Scientists often deduce the evolutionary history of the different members of a gene family by A) comparing the sequences of the genes. B) determining which of the genes are mutated in human diseases. C) comparing the relative enzymatic activities of the proteins encoded by the genes. D) overexpressing each of the genes in a cell and determining which has the most destructive effect. E) examining the relative stability of the mRNAs produced from the genes. ANS: A PTS: 1 TOP: Concept 19.5 59) The number of repeated units of simple sequence repeat DNA can vary between homologous chromosomes or between individuals. Such variation could be caused by 60) Which description below is nota way that transposable elements can contribute to genome evolution? The table below indicates the exons present in six different genes. Gene 1, for example, contains exons A, B, C, and D, in this order, and gene 2 has a similar structure, although exons A and B have been replaced by related but distinct versions called A' and B'. Gene Exons 1 A-B-C-D 2 A'-B'-C-D 3 A-B'-C-D 4 A-A-B-C-D
5 A-B-C-D' 6 E-F-B-G 61) The structural similarity seen in genes 1 through 5 suggests that they were most likely produced by 62) The repeated A exon in gene 4 is likely a product of A) exon shuffling. B) exon duplication. C) gene duplication. D) translocation. E) deletion. ANS: B PTS: 1 TOP: Concept 19.5 63) Gene 6 is mostly unrelated to the other genes, except for the presence of exon B. This is most likely a product of
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