Drosophila: Understanding Trait Transmission Across Generations

704 Words2 Pages

Drosophila Cross I: Segregation/Independent Assortment

Objective:
The purpose of this experiment was to understand how traits are passes from generation to generation, from parent to offspring. We learned how identify male and female Drosophila flies along with traits dealing with wing shape and eye color. Also, we explored and reaffirmed Mendel's Laws of Independent assortment and Segregation by growing fruit flies and following traits throughout the flies lineage.
.
Results:
One tube for the initial F1 cross utilized dumpy females and sepia males. A second tube contained the reciprocal cross. All females used were checked to make sure they were virgins. With a missed week in lab we were unable to remove the parents in the flies. The following weeks to obtain the data for the crosses shown in the tables below, we used flies prepared by the previous weeks Friday …show more content…

The parental crosses should have been virgin females with genotype dp-se+ and phenotype dumpy wings and wild type, red eyes with sepia males with the genotype dp+se- and phenotype normal wings and sepia eyes, along with its reciprocal cross. Due to lack of flies during lab, we only made tubes for virgin dumpy winged female and sepia male. The following week we were unable to remove the parent flies, so we had to use a previous labs premade flies to continue the experiment. An important concept to understand, that was not tested in this experiment, was that reciprocal crosses cannot be treated as the same for Drosophila when the traits observed are sex-linked. In this case the traits we are observing are not sex-linked, so it does not matter with our test cross. It was also important to use only virgin females when conducting all crosses to ensure that the female has not stored any semen for use later in mating. Thi was necessary so that we saw proper distribution of traits according to parental phenotype and genotype

More about Drosophila: Understanding Trait Transmission Across Generations

Open Document