• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Genetic Screening using CF as an example.

Extracts from this document...

Introduction

Yathavan Premadasan ? AS Biology Genetic Screening using CF as an example Word Count: 1497 Genetic screening is a very useful medical technique used to identify abnormal changes in chromosomes, genes or proteins. Genetic screening is used in several tests with more than 1000 available tests today, and more are being developed. (1) The outcomes of a genetic screening test can be used to identify a person?s chance of obtaining a genetic disease or passing on an inherited disease such as cystic fibrosis or help people make family decisions such as having children, having an abortion or even marriage. There are several types of genetic screening methods used today; some are carried out when making family decisions such as identification of carriers whilst others are used prior to birth during pregnancy such as prenatal screening or even some that are done before pregnancy such as preimplantation genetic diagnosis. Genetic screening is being increasingly used in adults with cystic fibrosis as an approach to make certain that families do not pass on the disease by letting families be able to make informed decisions about having children if they are carriers of the disease. ...read more.

Middle

Besides these disadvantages, there are many advantages for example, if a baby is found to possess cystic fibrosis then planning can be taken to help the child from day one of birth. Additionally, as an ultrasound is used during the screening process, the process can also be used to check on the ?general well being of a baby? and its gender can be accurately identified in the process. (3) The other method of prenatal genetic screening is called chorionic villus testing, which essentially is the same process to amniocentesis with both tests used for the same purpose ? to identify the presence of faulty CFTR genes. In this process, a sample of embryonic tissue is taken from the developing placenta using a catheter (tubes used to drain body fluids) as shown in image B. (4) By doing so, this creates a very large sample of fetal tissue available for testing. The placental cells contain the same genetic material as the cells of the developing baby. CVS is usually carried out earlier than amniocentesis - between the beginning of the 11th and the end of the 13th week of pregnancy. ...read more.

Conclusion

There are opportunities for False-positive and False-negative results being obtained; in a false-positive situation a fetus that has been identified positive of cystic fibrosis will actually be healthy and not have the disease at all, this therefore suggests if the couple decide to have this fetus aborted, they are actually aborting a perfectly healthy child and thus this is an issue couples have to consider and decide whether or not to take the risk of an abortion. In a false-negative result the test would indicate that the unborn child is free of cystic fibrosis however in reality the child will be born with cystic fibrosis and this could harm the couple?s relationship or affect the couple?s health mentally as they now have to look after a diseased child with cystic fibrosis. However, the chance of obtaining false results is extremely low and very rare. The risks mentioned above have to be considered against all the benefits that these screening tests can bring to a newly born child such as immediate treatment and the benefits to a couple?s relationship as informed decisions can be made as using the results. In most cases, the test results are very accurate and consequently the benefits can outweigh the risks. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Genetics, Evolution & Biodiversity section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Genetics, Evolution & Biodiversity essays

  1. Marked by a teacher

    MENTAL HEALTH

    4 star(s)

    This can affect around 1/10 people with the condition. - Cyclothymiacs This is where an individual's mood swings are not as bad, but are often longer. http://www.bbc.co.uk/health/conditions/mental_health/disorders_bipolar.shtml Causes The causes of Bipolar Disorder are unknown, but it's thought that the following could play a part in the condition, this includes the following: - Genes seem to be important, if

  2. Peer reviewed

    Is there a relationship between the girth of a tree trunk and the percentage ...

    4 star(s)

    One meter at one aspect was often different at another aspect of the same tree due to the uneven ground. This difficulty was overcome by measuring from the highest point of the uneven ground at each tree, therefore creating a systematic approach, which was the same at each tree.

  1. Peer reviewed

    The ethical and social implications of genetic screening

    4 star(s)

    It's also false to assume that all those people with disabilities lead lives filled with sadness and misery.

  2. Parkinsons Disease

    Painkillers like amantadine will also be used for more short term relieve along side drugs like levodopa. This will simply make life less painful for a PD patient. 3) Drugs are the most well know and reliable of PD treatments.

  1. Nature Vs Nurture

    There are, however, proponents of the idea that homosexuality is the result of the environment in which children are reared, specifically relating it to the behaviour of parents in rearing their offspring. However, once again the genetic and environmental views are not necessarily mutually exclusive.

  2. The Biology of Autistic Spectrum Disorder and the Social Implications

    To reduce or at best take away the disadvantages associated with disabled people, will depend on what is thought to be the cause of the disadvantages. There are two ways in which to explain what causes the disadvantages by using 'models' such as * The Model of Disability * The

  1. case study- cystic fibrosis

    Lots of religious believers feel that cloning is wrong because scientists are "playing god".Many people believe that the giving and taking of life is only to be judged by God and that only he should make it happen. Cloning Pictures and Diagrams: This diagram shows us how therapeutic cloning is

  2. inherited diseases - cystic fibrosis

    Doctors place a pad or filter paper on a patients arm or back. A chemical called Pilocarpine, makes a burst of electricity to produce more sweat. Then the pad is wrapped in plastic and is sent to a lab to get analyzed.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work