Facts on Down Syndrome Essays

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The presence of an extra chromosome is prevalent in plants but rare in animals. Diploid human cells contain 46 chromosomes, 44 autosomes and two sex chromosomes namely XX in females and XY in males. At mitotic metaphase, each of the chromosomes can be recognized by its size, shape and banding pattern. However, there could be non-disjunction of chromosomes during the process of meiosis, and as a result, one of the cells may receive an extra copy of the chromosome resulting in a condition called trisomy. One of the most common chromosome abnormality in humans is Down Syndrome, a condition associated with an extra chromosome 21. This condition was first described by British physician, Langdon Down (Web. Down Syndrome, n.d.).
Symptoms
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The presence of an extra chromosome is prevalent in plants but rare in animals. Diploid human cells contain 46 chromosomes, 44 autosomes and two sex chromosomes namely XX in females and XY in males. At mitotic metaphase, each of the chromosomes can be recognized by its size, shape and banding pattern. However, there could be non-disjunction of chromosomes during the process of meiosis, and as a result, one of the cells may receive an extra copy of the chromosome resulting in a condition called trisomy. One of the most common chromosome abnormality in humans is Down Syndrome, a condition associated with an extra chromosome 21. This condition was first described by British physician, Langdon Down (Web. Down Syndrome, n.d.).
Symptoms
Individuals with Down Syndrome are generally shorter in stature, have shorter necks, have loose-jointed ankles, have broader skulls, wider nostrils, large tongues with a distinctive furrowing, stubby hands with a crease on the palm, curved "pinky" fingers, upward slanting eyes, smaller ears, flat facial expressions, have weaker muscle (including the heart which is responsible for congenital heart imperfections) and other organ development issues. Such individuals also have impaired mental abilities and will require special training and care (Web. Down Syndrome, n.d.).

Age of onset Down Syndrome is a birth defect which is influenced by the age of the mother. As the age of the mother progresses chances of birth defects increases. For instance, if

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