Fruit Fly Lab Report
The Dumpy Sepia X Wild Type Dihybrid cross using Drosophila Melanogaster.
Abstract
An experiment was performed on the fruit fly (Drosophila Melanogaster) in order to investigate Gregor Mendel’s postulates and determine if his laws were in fact correct. This was done by crossing Virgin Wild type females with Dumpy sepia males, and then inter-crossing their progeny (the first filial generation) in order to produce the second filial generation which was then studied. The results of this were designed to illustrate the postulated 9:3:3:1 ratio of wild type: dumpy: sepia; dumpy sepia. Although the results did not fit the ratio perfectly they were quite close. This could be due to many factors, such as infertile flies or the lack of attraction between …show more content…
(Ashburner, M., Golic, KG et al, 2005)
Drosophila melanogaster was used in this experiment, in order to: 1) demonstrate the law of segregation in recessive alleles, example: dumpy and sepia are recessive alleles, i.e. the phenotype will only be expressed if the fly is homozygous for the allele, as the heterozygotes are indistinguishable from the homozygous wild type form showing that the wild type strain of the allele is dominant; 2) as well as to demonstrate the law of independent assortment in the segregation of one pair of alleles independently of another pair of alleles, which can be seen in the F2 generation, since the F1 generation is all heterozygotes.
This experiment was conducted in order to introduce the basic concepts of transmission genetics. Transmission genetics deals with the inheritance of genes from one generation to another (hereditary). Breeding experiments and the analysis of their results have contributed greatly to this
Abstract
An experiment was performed on the fruit fly (Drosophila Melanogaster) in order to investigate Gregor Mendel’s postulates and determine if his laws were in fact correct. This was done by crossing Virgin Wild type females with Dumpy sepia males, and then inter-crossing their progeny (the first filial generation) in order to produce the second filial generation which was then studied. The results of this were designed to illustrate the postulated 9:3:3:1 ratio of wild type: dumpy: sepia; dumpy sepia. Although the results did not fit the ratio perfectly they were quite close. This could be due to many factors, such as infertile flies or the lack of attraction between …show more content…
(Ashburner, M., Golic, KG et al, 2005)
Drosophila melanogaster was used in this experiment, in order to: 1) demonstrate the law of segregation in recessive alleles, example: dumpy and sepia are recessive alleles, i.e. the phenotype will only be expressed if the fly is homozygous for the allele, as the heterozygotes are indistinguishable from the homozygous wild type form showing that the wild type strain of the allele is dominant; 2) as well as to demonstrate the law of independent assortment in the segregation of one pair of alleles independently of another pair of alleles, which can be seen in the F2 generation, since the F1 generation is all heterozygotes.
This experiment was conducted in order to introduce the basic concepts of transmission genetics. Transmission genetics deals with the inheritance of genes from one generation to another (hereditary). Breeding experiments and the analysis of their results have contributed greatly to this