Fruit Fly Lab Report

melanogaster, leaving B and D to be our mutants. Before crossing our populations, we made not of each one’s phenotype in order to see how crossing them would affect their phenotypes: Population B flies had no wings and red eyes, population D had full wings and black eyes and population G had full wings and red eyes. We expected the resulting phenotypes to be some sort of combination, revealing which traits were dominant. However, what we did not expect was the abnormal mutant that arose in a couple of our populations.

This lab was a simulation of the capture and recapture and counting of birds. For example the West Nile Virus infected many birds and they would test the amount of birds with the virus, this is the way they would keep up on the spread of the virus. We tested the concept of the census and counting of all birds in a certain area. We used the beans which were marked and some werent.

Purpose The purpose of this experiment is to determine whether the fruit flies were dominant/recessive or linked/non-linked. The traits I chose for this activity was the fruit fly with vestigial wings and purple eyes, the other fruit fly I chose was a normal fly, also called wild type. While writing out my plan for this activity I thought it would be interesting to test a female mutant and the wild type male, the ratios I came up for this experiment was 2:2 and the mutant allele being recessive to the wild type. In this case, the words recessive and dominant means, if the child born from the parents inherits more of the genes and traits from let us say the father then the alleles of the father is dominant over the mother’s genes.

Introduction: Drosophila is the name given to a genus of small flies within the family, Drosophilidae. They are commonly referred to as fruit flies or pomace flies. They have historically been called vinegar or wine flies due to the fact that they commonly gather around rotting fruit. The fruit fly is sometimes mistaken for the Tephritidae family of flies which is closely related and is even sometimes referred to as the true fruit fly however; tephritids tend to only feed on unripe fruit, and have been regarded as destructive agricultural pests. For instance, the Mediterranean fruit fly has devastated the agricultural economy sector of several Mediterranean countries millions of dollars in ruined crops.

There were some sources of error in crossing between certain traits, specifically in determining the genotypes of the organisms being crossed. For example, there was no method of determining whether the wild type flies were homozygous dominant or heterozygous. The method used seemed reliable, but due to the questionable results, it may be more effective to find another

Methods The experiment involved groups of 4. Septic measures such a washing hand were used to minimizing any unwanted microbes. Equal fly food and distilled water was mixed to until it has a consistency of mashed potatoes. The food was solid enough to slide down into the slide yet moist enough for larvae to move around it.

We will use Punnett Squares to find out the genotype and phenotype in the offspring of the fruit flies. Our experimental hypothesis of this experiment is that the genes of the fruit flies are linked, where the body color of the fruit fly is dark (b) recessive or light (B) dominant and type of wing, normal wings (W) dominant and abnormal wings (w) recessive is linked. The null hypothesis is that there will be an unlinked ratio for the phenotypes if the loci was

Abstract The objective of this lab to, develop an understanding of the inheritance patterns observed in a fruit fly. For this experiment we used Drosophila melanogaster as a model organism due to its short life cycle, small size, and its virtual inexpensiveness. Drosophila melanogaster commonly known as the fruit fly used in this experiment provided experimental data that was in agreement with the laws of segregation and independent assortment proposed by Gregor Mendel.

Introduction Gregor Mendel, the father of genetics, established the basic principles of heredity by crossing different varieties of pea plants and observing the succession of traits in the resulting generations. In order to studying the trends of heredity, model organisms are crossed and observed for the resulting traits. Drosophilia melanogaster, the fruit fly, has been a useful species in the study and practice of genetics. The fruit fly is an excellent model organism due to its short generation time, large offspring numbers, simply and cheap care, easy handling in a lab setting, and large and varied stocks available with minimum cost. It was among the first organisms to be used for genetic analysis (Pierce, 2005).

In this experiment we tested to see what the offspring of an unknown cross of an F1 generation would produce. After observing the F2 generation and recording the data we found some of the Drosophila showed mutations, two in particular. The mutations were the apterus wings, and sepia eyes. After collecting our data through observation, a Chi-test was conducted resulting in a Chi-value of 5.1 and a p-value of .2. Since the p-value was greater than 0.05, there was no significant change in the data. This proved that the Drosophila flies still followed the Mendelian genetics of a 9:3:3:1 ratio.

This experiment looks at the relationship between genes, generations of a population and if genes are carried from one generation to another. By studying Drosophila melanogaster, starting with a parent group we crossed a variety of flies and observe the characteristics of the F1 generation. We then concluded that sex-linked genes and autosomal genes could indeed be traced through from the parent generation to the F1 generation.

Throughout this experiment a number of random and procedural errors were apparent; these errors could have affected the results of the experiment in a number of ways. One experimental error that occurred during the experiment was that some flies became stuck in the food source and died. The main cause of this was the fact that the fly vials were stood up (vertically) before the flies had fully recovered from the anaesthetic. This could be overcome in future experiments by ensuring that the vials are kept horizontal until all of the flies fully recover from the anaesthetic.

The discussion that public administrators should be restricted to only laid down rules in the discharge of their duties bears a great many implications. Whether or not they should have some amount of discretion in performance of their duties may vary greatly depending on the amount of oversight required for the particular level of administration.  Administrators working in the U.S. capitol may not be allowed the same freedom to execute tasks as those working in a small municipality.

Patients who present with a traumatic brain injury (TMI), are at greatest risk of developing respiratory distress syndrome (RDS), which increases their death rate. The study of this article is to show the comparison of respiratory mechanics and the death rate with patients who present with a TMI and RDS with those patients who have RDS without a TMI, but other medical causes of the RDS. This study was performed in a 14-month period in a general intensive care and teaching unit in Brazil. It looked at patients who were in the ICU due to RDS with or without the cause being a TMI. A total of 85 patients were assessed in this timeframe: 30 of the patients presented with a TMI without RDS, 17 were present with a TMI and acute RDS, and

A forest is the most diverse and richest biological system on the face of earth. Forests are essential to the global environment because of their profound impacts on ecology, culture and economy. According to David Suzuki, “Canada’s forests cover almost half of the country’s landmass and make up 10 percent of the world’s forest cover. Forests are a crucial part of Canada’s natural heritage, wilderness areas and economy” (Para2). Canadian forests play a primary role in the life of Canadians; however, exploitation of this natural wealth brings harm to the country. Logging operations in the forests brings long term harms to the biodiversity if not done sustainably. The logging has several negative impacts on our