GenCh16answers - Dissection of Gene Function 1 6 This would...

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Dissection of Gene Function 1. This would be considered a screen for auxotrophs. If it were a selection, only the desired mutant phenotype would survive. 6. Wild-type flies migrate towards the light. Any mutation that affects the detection of light or the behavior of positive phototaxis will cause flies to randomly follow the dark rather than the light pathway. 10. These phrases are used as “pace holders” so that protocols, experiments, and results may be discussed generically without concern for any specific gene or unique situations. 12. The LacZ construct is carried on a transposon. Crosses are made that mobilize the construct so that it is transposed to various, random sites in the genome. Flies with the inserted transgene are then screened for LacZ expression. Those flies with the desired expression pattern have insertions near genes that are candidates for involvement in some aspect of head development.
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