G DNA segment needed to make a protein

G DNA segment needed to make a protein - encodes only 467...

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G DNA segment needed to make a protein Genes are typically 10 3 - 10 4 base pairs in size although they can be much larger. For example, the human dystrophin gene is 2 x 10 6 base pairs. E.coli has about 4,200 genes which isn’t very many considering that at least 1,000 different enzymes are needed carry out just the basic biochemical reactions in a cell. The smallest genome for a free- living organism (i.e. a cell, not a virus) is that of the bacterium Mycoplasma genetalium which
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Unformatted text preview: encodes only 467 genes. Humans are at the other end of the spectrum of complexity and have about 35,000 genes. In the demonstration in class you see how a mutation in the Shibire gene in the fly Drosophila gives a heat sensitive protein that is required for synaptic transmission. When the flies that carry this mutation are warmed by the projector lamp they become paralyzed....
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