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hwanjin_lee

HowStuffWorks "DNA Structure" - 2 views

  • the DNA in a cell is really just a pattern made up of four different parts called nucleotides.
  • Imagine a set of blocks that has only four shapes, or an alphabet that has only four letters. DNA is a long string of these blocks or letters. Each nucleotide consists of a sugar (deoxyribose) bound on one side to a phosphate group and bound on the other side to a nitrogenous base.
  • Watson and Crick discovered that DNA had two sides, or strands, and that these strands were twisted together like a twisted ladder -- the double helix.
  • ...2 more annotations...
  • Although it may look complicated, the DNA in a cell is really just a pattern made up of four different parts called nucleotides.
  • There are two classes of nitrogen bases called purines (double-ringed structures) and pyrimidines (single-ringed structures).
chealing

DNA - structure - 0 views

  • The diagram shows a tiny bit of a DNA double helix.
  • The full name of DNA, deoxyribonucleic acid, gives you the name of the sugar present - deoxyribose.
  • What we have produced is known as a nucleotide.
  • ...2 more annotations...
  • Have another look at the diagram we started from:
  • adenine (A) pairs with thymine (T); guanine (G) pairs with cytosine (C).
suhak1234

Genetic disorders | Better Health Channel - 1 views

  • Occasionally an error occurs during the division: for example, the egg or sperm might be missing a chromosome (22 chromosomes) or have an extra one (24 chromosomes), so at conception the baby has either too few (45) or too many (47) chromosomes. A well-known example of this type of genetic disorder is Down syndrome, where a person has 47 chromosomes rather than 46.
  • Over 1,000 known disorders are caused by chromosome abnormalities. A chromosome disorder means there is a change in either the structure or the number of chromosomes. This can happen in three main ways: The altered chromosome is passed from the parent to the child The abnormality happens when either the sperm or egg (germ cells) is created Soon after conception.
  • Around 6,000 known genetic disorders are caused by inheriting an altered gene.
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