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AS and A Level: Genetics, Evolution & Biodiversity

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  1. AP Biology Lab Seven: Genetics of Organisms.Hypothesis In the sex linked cross of Drosophila Melanogaster, a phenotypic ratio of 1:1 will be obtained.

    The larval stage of the Drosophila eats all the time. Larvae tunnel into the culture medium when they eat. The larva will shed its skin as it increases in size. In the last of the three larval stages, the cells of the salivary glands contain giant chromosomes that can be seen under low power in a microscope. The pupal stage. Before a larva becomes a pupa it climbs the side of the container. The last larval covering then becomes harder and darker, forming the pupal case. Through this case the later stages of metamorphosis to an adult fly can be seen.

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