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  • Y Chromosome Research Paper

    Y chromosome is a sex determine chromosome among many species including modern humans. Modern studies in genome suggested that Y chromosome arose from the accumulations of mutations of other chromosomes and have some special genes on it which determine the gender of the carrier; however, some non-mammalian animals carry the Y chromosome even if their genders are not determine by the appearance of the Y chromosome. The Y chromosome works differently on the mammalian and non-mammalian so in this paper when an aspect about Y chromosome is brought up, it well be discussed in both mammalian (use human as example) and non-mammalian (use Drosophila as example) case. The paper will mainly focus on three point: how Y chromosome originated; the function of Y chromosome and the position of Y chromosome in the study of evolution. The origin of Y chromosome Researchers who study the mammalian Y chromosome believe that the Y chromosome arose from the X chromosome. The researchers found that there is a male-specific region on human Y chromosome which consists of several special sequence: X—transposed and X-degenerate (Skalesky et al. 2003): The X-transposed sequence is very similar to the X chromosome and the X-degenerate sequence showed that the X and Y chromosome shared a pair of autosome ancestors (Skalesky et al. 2003). The arise of Y chromosome was likely due to…

    Words: 1644 - Pages: 7
  • Differences Of Mitosis And Meiosis

    number of chromosomes of the parent cell. The process of meiosis occurs…

    Words: 1256 - Pages: 6
  • Conclusion Of Down Syndrome

    DNA and prepare for cell division during interphase. At this point, the cell would be called a diploid cell, because it contains two sets of chromosomes, one from the mother and the other from the father. Once the preparations are done, the cell enters prophase I where DNA supercoils to condense into chromosomes, and the chromosomes pairs up with its homologous chromosome. The process of pairing with its homologous chromosome in the chiasmata is called synapsis, which would result in the…

    Words: 767 - Pages: 4
  • Cell Division In Cell Theory

    the daughter cells having the same number of chromosomes as the parent cell. We need cell division as it is used in reproduction of new species, growth and repair of damaged cells and tissues, and to reduce the cell size. Larger cells are insufficient, as it needs more nutrients (such as sugar and proteins) for energy and excretion of wastes (mainly CO2), whereas when broken down to smaller cell has a smaller ratio of volume to surface area is much more ideal. It is carried out through the…

    Words: 3013 - Pages: 13
  • Meiosis And Mitosis: The Process Of The Three Types Of Cell Division

    Meiosis and mitosis are more complicated processes of cell division. Mitosis is part of the process used when a cell replicates itself, in its exact form. The cell duplicates perfectly, with the same DNA. During this phase, the chromosomes align, separate, and are moved to…

    Words: 723 - Pages: 3
  • Abnormal Inheritance Essay

    Chromosomal inheritance relates to how a person has 2 sets of chromosomes, 46 in total, that they inherited their parents. Chromosomes carry the genes, particularly the alleles that the offspring inherit. Gregor Mendel had no understanding of chromosomes when conducting his studies. He experimented and tested peas and discovered that some genes were dominated (showed up) while others were recessive (hidden). What he didn’t know was that chromosomes contained the genes that were responsible for…

    Words: 986 - Pages: 4
  • Sexual Dimorphism In Human Development

    Sperm containing the Y chromosome with a properly functioning SRY gene determines male gender, and if contains the genetic material of the X chromosome is shaped female. The presence of the SRY gene is the basic criterion of gender gene in humans. Discovered in 1990 by a group of P. Goodfellow from the University of Cambridge ,SRY gene is called the "central switch of the masculinity" and is located on the short arm of the Y chromosome locus…

    Words: 2426 - Pages: 10
  • What Is Down Syndrome Essay

    of the time Down syndrome is caused by an extra copy of chromosome 21…

    Words: 1130 - Pages: 5
  • Down Syndrome Case Study

    Background: What is Down Syndrome? Down Syndrome is a chromosomal disorder caused by an error in cell division that results in an extra twenty-first chromosome, that causes birth defects of developmental and intellectual delays. The human body is composed of trillions of cells and within the nucleus of each cell are structures called chromosomes (Parks, 2009). About eight million babies are diagnosed with Down Syndrome in the United States with approximately twenty thousand in Western Europe…

    Words: 1915 - Pages: 8
  • The Characteristics Of Immutated Diseases

    advantage or disadvantage, but neutral. There are two kinds of chromosomes that are present inside cells and that are passed on to offspring during sexual reproduction. These are autosomes and sex chromosomes mutations in each determine. Some traits however can be harmful. An example of this are diseases that are present in an organism because of a mutation in the DNA of the ancestors of that organism. “An inherited disease is a disease that is transmitted in the genes of an organism inherits…

    Words: 885 - Pages: 4
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