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AS and A Level: Genetics, Evolution & Biodiversity

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  • Marked by Teachers essays 33
  • Peer Reviewed essays 15
  1. Marked by a teacher

    Too Much Information: Genetic Testing

    5 star(s)

    Some examples of these genetic conditions include Tay-Sach's disease, Bloom syndrome, Deafness, cystic fibrosis, and many other diseases (http://www.einstein.edu/e3front.dll?durki=7158). Although many of these conditions are fatal, the ones that are not can be treated early, even before symptoms develop when possible, or if not treated, at least monitored because of the person's high risk of becoming afflicted. If genetic testing is 95 per cent accurate, which is a reasonable margin of error by any standard, then one in twenty people who take the test will get a false result.

    • Word count: 938
  2. Marked by a teacher

    Compare the Similarities and Differences between Meiosis and Mitosis

    4 star(s)

    These daughter cells are clones to the parent cell. On the other hand, meiosis provides gametes that contain only half the number of chromosome number of an adult cell so that when gametes fuse together in fertilisation, a diploid zygote is formed. Genetic materials in daughter cells of meiosis are slightly different to adult cell due to variation from independent assortment and crossing-over of material. Overview of different phases: Both mitosis and meiosis consists of four main phases: prophase, metaphase, anaphase & telophase.

    • Word count: 629
  3. Peer reviewed

    Cystic Fibrosis

    4 star(s)

    The CFTR gene is responsible for producing the CFTR protein, which allows Cl- ions to diffuse out of cells in water regulation. If the gene in the DNA is mutated, the mRNA produced in transcription will code for the wrong sequence of amino acids, so the protein made by the mRNA in translation will be the wrong shape, and therefore will not function correctly. This diagram shows the normal situation, where there is too much water in the mucus (outside the apical end of the cell).

    • Word count: 717
  4. Peer reviewed

    The ethical and social implications of genetic screening

    4 star(s)

    Already we take for granted pre-natal screening, in which genes are analysed from a sample of anionic fluid, and in many cases foetuses with abnormal genes are aborted. Could knowledge of more genes, and therefore increasing the likelihood of spotting a faulty or abnormal gene, lead to an increase in abortion rate? Of course, some people believe the terminations would be justified. Maybe the termination would be better for the parties involved. It would make life easier for the parents as life would surely be difficult with a disabled child and perhaps, awful it may sound, it may be better for the child.

    • Word count: 978

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