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Unformatted text preview: 1. Pattern formation in insects depends on the sequential activation of key groups of genes (see figure). Of the genes listed below, select the most specific gene group that is normally first to be activated in the fruit fly, Drosophila melanogaster, development. Gap genes Segment-polarity genes Homeotic genes Segmentation genes Pair-rule genes 2. Suppose a fruit fly has two sets of wings growing from its thorax (instead of a single pair of wings and a pair of haltares or balance organs). Where might there be a mutation in this fruit fly? Gap genes Segment polarity genes Homeotic genes Egg polarity genes Pair-rule genes 3. Researchers have found homeotic genes in humans, but they are not yet certain how these genes shape the human phenotype. Considering the functions of homeotic genes in other animals, which of the following is most likely to be their function in humans? Determining skin and hair color Regulating the cellular metabolic rate Determining that arms come off the upper portion of the torso and ears belong on the sides of the head...
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- Spring '08