Today we did lab 2, on Mendelian genetics.
The goal of this lab was to observe the phenotypic consequences of the principles of segregation and independent assortment. We used the free software DrosophiLab to simulate experimental crosses with fruit flies. Most of the crosses were testcrosses, meaning that one of the individuals involved in the cross was homozygous recessive for the trait being considered (in this case a homozygous recessive individual would be a mutant fly. The mutation would have an observable phenotype).
A series of three experiments considering one trait, two traits controlled by genes in different chromosomes, and one trait controlled by a gene in a sex chromosome should have shown students how to see the effects of Mendel's principles in an experiment.
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