Drosophilia Lab Report

Topics: Genetics, Gregor Mendel, Allele Pages: 3 (1055 words) Published: April 16, 2014
Morgan Kimmerle
Monday Lab
Dr. McCorkell
Abstract
The purpose of this study was to cross and analyze the reciprocal crosses of wild flies and mutant flies. In this lab Drosophila melanogaster commonly known as fruit flies were used to understand some important genetic principles that were once proposed by Gregor Mendel. Mutant traits can be autosomal dominant, autosomal recessive traits, or even sex-linked dominant and sex-linked recessive. F1 and F2 generations were obtained by performing simple parental crosses. This was done so we could determine the mode of inheritance of the genetic trait of body color and eye color. The mode of inheritance was different for all of the crosses but all deal with Mendel’s principles. Our results from the chi square analysis data all showed signs of our observed dating matching almost exactly to our expected data. Introduction

Drosophila melanogaster are very useful tools in the study of genetics. Drosophilas are the most commonly used organism in genetic labs, because they have a short life span and they are a very simple organisms genetically. In this experiment we are hoping to determine phenotypic ratios and dominant vs. recessive traits by cross breeding two different types of Drosophila; such as wild type flies (tan bodies) with golden body fly mutants, and wild type flies (red eye) with dark eye drosophila. When crossing the wild-type tan body fly with the mutant golden body fly we will expect to see a 3:1 ratio in the F1 Generation. For every three wild type tan bodies flies we will expect to see one golden bodied fly. We would expect to see the same outcome for the F2 Generation. The trait for body color is autosomal recessive in the golden bodied drosophila. The allele for the tan bodyis dominant over the recessive golden body, because tan bodies are standard in flies where as golden bodies are a recessive mutant allele. After collecting data from the entire class and performing a chi square analysis...
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