Lab+7+Genetics+of+Organisms

Purpose: The purpose of this lab was to understand the life cycle of diploid organisms useful in genetics by analyzing F1 and F2 generations.

Summary of Data: Depending on the traits you chose for your fruit flies, you could tell whether certain traits are sex-linked or not. You could also tell if the cross was monohybrid or dihybrid, and which traits are dominant and which are recessive. Also depending on which traits you chose, you should have seen a pattern in the ratios of dominant to recessive. You should have gotten a 3:1 ratio, or a 1:1 ratio, or a 1:1:1:1 ratio.

Conclusion: Because Hardy-Weinberg represents a "perfect" population, nobody's population should have met these requirements. Factors effecting an equilibrium would have been population size. A big population size would minimize genetic drift. There could not have been natural selection because there are no alleles favored or disfavored by the environment. Also, there could be no mutations, and the mating has to be random. It is almost impossible for a population to be in Hardy-Weinberg equilibrium.

Our results are valid because it did not follow the Hardy-Weinberg equilibrium. That proves that evolution is occurring.