This website uses cookies to ensure you have the best experience. Learn more

Biology Essay

1360 words - 6 pages

Mitosis and Meiosis at first seem much alike for that they both are forms of cellular reproduction. Moreover, they go through similar stages such as interphase, prophrase, metaphase, anaphase, telophase, and cytokenisis. However, despite their similarities, these two processes are much different and have their own specific importance in cell reproduction. Mitosis evolved because it is a process that occurs in somatic cells and allows the division of a cell into two genetically identical daughter cells that are called diploids (2n) and have the total amount of chromosomes. In mitosis, the only difference between an animal cell and a plant cell will be during the cytokenisis stage. In an ...view middle of the document...

If mitosis were the only cell reproduction process, diploid cells would fusion with another diploid during sexual reproduction resulting in an increase of the number of chromosomes in organisms throughout the generations. Also, meiosis is beneficial because it increases genetic variation through the production of new combinations of alleles, specifically crossing over during meiosis. Crossing over is the exchange of chromosome fragments at points called chiasmata between nonsister chromosomes of a pair of homologues. It results in the different combination of alleles in organisms. Independent assortment and random fertilization is also a way to obtain genetic variations. Finally, meiosis and crossover help prevent inherited disorders. Crossover can eliminate a disorder that a parent has and passes genetically. Thus, meiosis allows the positive evolution of species throughout the generations. On the other hand, the importance of mitosis is the maintenance of the chromosomal set. Each cell formed receives chromosomes that are alike in composition and equal in number to the chromosomes of the parent cell. Mitosis also helps the cell in maintaining proper size and equilibrium in the amount of DNA and RNA in the cell. Moreover, the growth of multicellular organism is due to mitosis. Mitotic cells are produced until the particular size has been reached. Again, the old, decaying and dead cells of the body are replaced by the process of mitosis.

Mitosis and meiosis have similarities but also some differences. In a general point of view, both mitosis and meiosis are mechanisms that describe cell division. Meiosis reduces the number of chromosome sets from one diploid to four haploids, whereas mitosis conserves the number of chromosome sets from one diploid to two diploids. Therefore, mitosis produces daughter cells genetically identical to their parent cell and to each other, whereas meiosis produces cells that differ genetically from their parent cell and from each other. In an organism that is n=8, a germ cell will have 8 chromosomes [n], half the total number found in a somatic cell (which would be in this case 16 [2n]). Then, a male and female gametes fusion together to form a diploid zygote with 16 chromosomes. The zygote will then develop and remain a diploid with 16 chromsomes (2n). To reach those numbers, each process goes through stages (see image below). Both, mitosis and meiosis, in their first stage of division, replicate DNA during interphase. However, in meiosis there is an additional second division during which the number of chromosomes remain the same, explaining why germ cells have only half the total number of chromosomes. Moreover, in meiosis,during prophase I, crossing over occurs between the non-sister chromatids (genes variation). In mitosis, this synapsis of homologous chromosomes does not occur. Later on in the process, at metaphase I of meiosis, tetrads are positioned on the metaphase plate, rather than individual replicated...

Other Papers Like Biology Essay

Biology GM Foods Essay

1122 words - 5 pages Biology essay: The advantages and disadvantages of genetically modified foodFor thousands of years we temped with genes of plants by traditional breeding, but only within the same species. Genetic modified food start to take place all over the world in the 20th century. This is the movement of genetic material from one organism to another but the type of organism does not have to be the same, which means that it could be a movement from a gene

Biology Essay

949 words - 4 pages Year 11 Proposal for Oral Presentation 2014Name:What is the central idea of your reflection: Consider the suggestions on the task sheet or invent your own.Acceptable/unacceptable humourEmpowerment/disempowermentHumour and minority groupsHumour and politicsHumour and genderThe role of experience and prior knowledge in making meaningPower of SatireHumour and tragedyHow the meanings of humorous texts can change over time or in different


678 words - 3 pages development are driven by continuous generation of new cells. (Inze, D. &DeVeylder, L. The plant cycle Annu.Rev Plant Biology, 54 235-236, 2006). There are several similarities in both cells. ATP in common in both plant cells and solar cells. ATP synthase is a ubiquitous membrane enzyme that plays a key role in biological energy metabolism. This enzyme interconverts two major "energy currencies" of a living cell: adenosine triphosphate (ATP


2176 words - 9 pages : Discuss the influence of the internet on teenagers and young adults. Support your argument with examples and evidence. From talking to your partner, do you have any new thoughts about what you could include in your essay? What you can use from sources in academic writing (E) The sources you choose as your background reading for an essay topic will contain a great range of ideas and information. Part of your task, as a good academic writer and

Biology - 304 words

304 words - 2 pages New Prescription YOUR PATIENT WOULD LIKE TO RECEIVE THEIR PRESCRIPTION MEDICATION BY MAIL. 34202 Please complete ALL information below. STEP 1 Note to Prescriber Prescriber Name Prescriber Information Questions? Call 1.888.327.9791 DEA Required for CIII-CV medications Secure fax number NPI STEP 2 Member No. Member Information 1 7 0 6 2 8 1 4 1 1 7 9 (Include all characters.Leave box blank for spaces ) Member

Biology - 467 words

467 words - 2 pages Voices on Antisemitism I choose to do my paper on Diana Dumitru because during her interview she brought up an amazing case to the public about anti-Semitism. Diana is a professor for history in Ion Creangă State University, Moldova she has been setting up cases for the world to see that anti-Semitism can be changed into a positive way and a negative way and that it has been done after WWI. During WWI there was two parts of

Biology - 1326 words

1326 words - 6 pages Cell wall Plant cell and animal cell are different in shape, size and also has few different organelles which function in different way. One of the main difference between plant cells and animal cells is that plant cells have a cell wall, whereas animal cells don't. Instead of cell wall animal cells have cell membrane but the plant cells have both cell wall and cell membrane. The cell wall in plant cells work as a protection layer outside

Biology Paper

543 words - 3 pages Onion Lab Introduction Looking at two different onions that are two different sizes, one that is rounder and taller than the other but not by much, a question comes to mind. What makes one onion bigger than the other? Pondering this subject you could come up with a couple of different reasons why one would be bigger than the other. Knowing from prior observations that onions were composed of layers, the thickness of the layers

Nic Biology

1707 words - 7 pages Biology Module 2: Assignment 2 The Respiratory Tract The function of the respiratory system is to transport air into and out of the lungs and to facilitate the diffusion of oxygen into the blood stream, in order to carry it around the body and help remove carbon dioxide. The respiratory system is made up of tissues and organs in the body that enables us to breathe. It is divided into the upper and lower respiratory tracts. The upper

Biology Vocabulary

2608 words - 11 pages 1. Biology: The study of life 2. Organization: the high degree of order within an organism's internal and external parts and in its interactions with the living world 3. Cell: the smallest unit that can perform all life's processes 4. Unicellular: made up of one cell 5. Multicellular: multiple cells 6. Organ: a structure that carries out specialized jobs within an organ system 7. Tissues: groups of cells that have similar abilities and

Biology Article

615 words - 3 pages Biology 1210 Professor Dawson 5 February 2014 Article Two Naturally, species go extinct. It’s part of life. Species generally are born and die within a million year time scale. That million year time scale is the natural rate of extinction. However, unknown to most people, the actual time scale at which species are disappearing from the planet is actually one hundred times higher than the natural rate. Obviously, this is alarming. Species

Related Essays

Biology Essay

1906 words - 8 pages hapter 8 8.1 The ability of organisms to reproduce their won kind is the one characteristic that best distinguishes living things from nonliving matter. Reproduction actually occurs much more often at the cellular level. Cell division when a cell undergoes reproduction the two daughter cells that result are genetically identical to each other and to original parent cell. Chromosomes, the structures that contain most of the cell’s DNA

Biology Cell Transport Essay

699 words - 3 pages There are two types of cell transport mechanisms. These types of transports are passive and active transport. The difference between active and passive is that passive does not require energy and active does require energy. The reason passive does not require energy is because it travels down a concentration gradient. On a concentration gradient molecules naturally move from high to low concentration. In active transport, molecules move from low

Marine Biology Career Essay

1486 words - 6 pages Harry Opfar Research Essay Viability of Marine Biology as a Major When deciding on a major for my college education, I had to find a field both in demand and it had to be a field I would like to spend the rest of my life in. I have always had a love of the animals in sea and several years ago had an opportunity to go to Sea World in San Diego. Recalling this trip and the recollection of seeing the dolphins and whales perform actually

Foundation Of Molecular Biology Essay

3702 words - 15 pages enough of the bacterium containing the gene of interest within a plasmid, DNA is extracted to obtain large amounts of the gene. 6. Write an essay on a protein involved in the molecular biology of muscle function or development The growth of muscle is a product and interplay of complex molecular biology cellular process that involves the interaction of various cellular organelles precipitated by a repetetive resistance exercise. Muscle