Endomitosis in Drosophila Virilis

NB: We do not resell your papers. Upon ordering, we do an original paper exclusively for you.

NB: All your data is kept safe from the public.

Background & Purpose

Endomitosis is a variant of the cell cycle that leads to the production of up to a thousand copies of the genome. During this process, the cell does not divide but the chromosomes increase in size as the number of copies of genes increases. The purpose of this lab was to investigate endomitosis in the salivary glands of Drosophila virilis larvae. It was hypothesized that endomitosis also occurs in the salivary glands of Drosophila virilis. This hypothesis was formulated based on the fact that endomitosis has been reported to occur in Drosophila melanogaster, which is closely related to Drosophila virilis.

Results

The images of the human cells and salivary glands of Drosophila virilis as observed under the compound microscope are shown in the appendix in figures 1 and 2.

Discussion

It was hypothesized that endomitosis took place in the salivary glands of Drosophila virilis. The findings of the experiment showed the presence of polytene chromosomes, which were only produced in endomitosis, in the salivary glands of the larvae of Drosophila virilis as shown in figure 2. The polytene chromosomes were distinctive from the mitotic chromosomes in human cells (shown in figure 1). Some of the major differences were the sizes of the two chromosomes. Figure 1 showed small mitotic chromosomes in human cells while figure 2 showed significantly big polytene chromosomes in the salivary glands of Drosophila virilis. Another major difference was the presence of several polytene chromosome arms in Drosophila virilis whereas the human mitotic chromosome only had four distinctive arms. However, the chromocenter of the polytene chromosome was not easily distinguishable. Therefore, the findings of this experiment supported the hypothesis that endomitosis occurred in the salivary glands of Drosophila virilis larvae.

Appendix

Figures

Figure 1: Mitotic chromosomes in human cells. The above figure shows the mitotic chromosomes in humans as well as distinct chromosomes. The samples were obtained by staining the cells in aceto-orcein stain and observing under a compound microscope at ×40 objective lens.

Figure 2: Polytene chromosomes of Drosophila virilis. The above figure shows the polytene chromosomes in Drosophila virilis as well as the chromosome arms. The samples were obtained by staining the salivary glands of D. virilis in aceto-orcein stain and observing under a compound microscope at ×40 objective lens.

Click Here To Order Now!

Endomitosis in Drosophila Virilis

Do you need this or any other assignment done for you from scratch?

We have qualified writers to help you.

We assure you a quality paper that is 100% free from plagiarism and AI.

You can choose either format of your choice ( Apa, Mla, Havard, Chicago, or any other)