You are interested in Drosophila genes involved in vision. If you subject flies

Question

You are interested in Drosophila genes involved in vision. If you subject flies to EMS and kill off offspring that can see attractive light sources in order to select for poor vision mutants, you are conducting a _____ screen. Let's say you are mapping the location of one of your mutations that causes blindness using a testcross. You get counts of offspring phenotypes that suggest that your two markers are so close to the mutation that they seem like they are right on top of it. In one sentence, explain what those counts of offspring phenotypes would need to have been in order to draw that conclusion.

Explanation / Answer

16.(a)- Phenotypic screen- o phenotypic/genetic screen is an experimental technique used to identify and select individuals who possess a phenotype of interest. Genetic screens can provide important information on gene function as well as molecular events.

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