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The Story of Molecular Biology and Its Creators
The Story of Molecular Biology and Its Creators

... the segregation of other pairs in the formation of gametes. ...
Review - hrsbstaff.ednet.ns.ca
Review - hrsbstaff.ednet.ns.ca

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Supplementary Information (doc 63K)

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An Introduction to DNA and Genetics Directions: As you watch the

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... simple units called nucleotides, with backbones made of sugars and phosphate groups joined by bonds. -These two strands run in opposite directions to each other and are therefore anti-parallel. Attached to each sugar is one of four types of molecules called bases. It is the sequence of these four ba ...
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... activities of the genes. A strand 150 to 200 nucleotides long is wrapped twice around a core of eight histone proteins to form a structure called a nucleosome. The histone octamer at the centre of the nucleosome is formed from two units each of histones H2A, H2B, H3, and H4. The chains of histones a ...
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From DNA to Proteins
From DNA to Proteins

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Mutagen



In genetics, a mutagen is a physical or chemical agent that changes the genetic material, usually DNA, of an organism and thus increases the frequency of mutations above the natural background level. As many mutations can cause cancer, mutagens are therefore also likely to be carcinogens. Not all mutations are caused by mutagens: so-called ""spontaneous mutations"" occur due to spontaneous hydrolysis, errors in DNA replication, repair and recombination.
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