Drosophila At Room Temperature Essay

This lab was about how a goldfish’s breathing rate changes in different temperatures in order to maintain homeostasis.

Short movement between plants as adults, eggs transfer in soil by adhering to stock. Movement in summer caused by over-summering eggs being translocated by wind. Over-summering eggs need “approx. 2 weeks of exposure to favourable conditions” (DEPI VIC) to hatch.

Drosophila Melanogaster, commonly known as fruit flies, are highly important model organisms in pertaining to biological research. The logic behind their recurrent use is due to their: easy culture in the laboratory, brief generation time, and ability to produce large numbers of offspring. In this report, we created isolated virgin D. Melanogaster from the original three populations we were given and then created crosses between them. Upon observation, we noticed an unusual mutant that arose from two of the three created crosses. We suspected that this genetic mutation had previously been discovered and named.

Steps 7-11 were repeated to record the phenotype of the F2 generation and number of male or female flies.

Heterozygotes, which have the wild type phenotype, have normal sight which gives them the advantage of finding a mate and have a better success with attracting a mate with their courtship song (Kyriacou et al, 1978). The male heterozygous Drosophila had a better advantage at mating than the homozygotes, which were the ebony, and therefore we predict there will be more wild type by the end of the experiment.

After collecting all eight samples, they were then placed in the Petri dishes. The Petri dishes were both placed in an incubator. The temperature at that time was 80 degrees Fahrenheit. The samples remained in the incubator for over 24 hrs, by which time, quite a lot of growth was formed.

The aim of this experiment was to determine the temperature effect on metabolic rate in Daphnia. From carrying out this test we would expect there will be a difference in heart beats per minute between Daphnias kept at different temperatures as they are an ectothermic organism which means that their temperature will vary to that of the environment. MacArthur, J.W. and Baillie, W.H.T., 1929. Metabolic activity and duration of life. II.

In this experiment first the stages of an onion cell undergoing mitosis are going to be observed and every stage is going to be detected and drawn on paper. A brief description to what is going on should be attached to the pictures. This is important to understand the basics of cell division which is necessary growth,repair and asexual reproduction. Second the number of cells undergoing each phase is going to be counted to figure out in which phase the cell remains the most. If interphase is the stage in which the cell grows and prepares for cell division then the

4.14. The accuracy of the data is dependent on the correct controls being in place, Ensuring temperate stays the same throughout all solutions, making sure that the solutions are correct that the weight and size of the eggs are the measured correctly and that when the eggs are removed they are removed at the same time. Some of the eggs were not completely submerged in the solution this may cause some errors in the experiment and may have caused varying results. The eggs were of different sizes this also will cause the results to vary, Gathering eggs of exact size and weight would have ensured the results were correct. The eggs may not have been dried enough also causing results to vary; this can be fixed by ensuring that the eggs are thoroughly dried. The eggs were taken out at a time around about 24 hours, having an exact time to remove the eggs would have eliminated errors.

We then kept the vial with the juvenile Drosophila for another 2 weeks in the same conditions as above and found that the F1 generation had hatched and laid eggs of their own. We then decanted the F1 generation into alcohol to kill them and kept them aside to score. The vial containing the new generation F2 of Drosophila was then kept for use in a further experiment.

The first day, the farm shop had 47 colonies, our member’s mouth had 43 colonies, and the snow only had 4 colonies. Then we put them back into the incubator for two days and made our last observations, and the farm shop had 525 colonies, they were punctiform, smooth and had a low raise. Our member’s mouth had 112 colonies, they were punctiform, smooth, and had a raise. Also, the snow had 6 colonies, they were punctiform, smooth, and was

For just a brief moment, imagine yourself sometime in the future. You have been recently married, you just started a brand new job, and are looking to start a family. As a way to plan for financial security, you have done some research into financial investments. You are hoping to build a portfolio, which will be a mix of low, median, and high-risk stock. Flash forward into the future by 20 years. During this time, the stock prices have appreciated and depreciated, yet overall done remarkably well. All of a sudden, one morning you wake up to some disastrous news. One of the company’s you invested in, which held a majority of the portfolio of stock, has been participating in financial fraud. While they had been presenting themselves well, under the surface deceptive accounting and financial practices were being used and now the company is broke. All of your hard earned money which was invested in that company is now gone-down to the last penny. Does this sound vaguely familiar? It should. In 2001, Enron, a United States company, became the very largest bankruptcy and stock collapse in history (Columbia Electronic Encyclopedia). As a result, in 2002, The Sarbanes-Oxley Act was passed as means to prevent fraud, improve financial reporting, and gain back the trust that was previously lost by investors. Although numerous publicly traded companies, which are companies registered on the U.S. stock exchange, were less than happy to welcome

Existence cycle: A dragonfly undergoes incomplete metamorphosis. The larva hatches from an egg that is laid in water, in vegetation near water, or maybe underwater. As this aquatic (residing in the water) larva (known as a nymph) grows, it molts (loses its vintage pores and skin) often. While fully-grown, it emerges

It is possible that the temperature at which the flies were kept dropped significantly below 20 degrees Celsius; this could have caused the death of some of the files or slowed down their growth and reproduction rate. This would result in there being fewer flies. This problem could be overcome in further experiments by using a larger heating device with a more responsive thermostat to keep the Fly house within the recommended temperature range for D. melanogaster.

Some larva containing vials had hatched into flies. Counting of the flies began at this point. As flies started to grow, at different rates for each vial, with in the first seven days after all larva had hatched the flies were counted. The procedure was done according to theDrosophila manual (45-2620)