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gene - Hutchinson encyclopedia article about gene (Site not responding. Last check: 2007-10-08) |
 | | Also termed a Mendelian gene, after Austrian biologist Gregor Mendel, it occurs at a particular point, or locus, on a particular chromosome and may have several variants, or alleles, each specifying a particular form of that character – for example, the alleles for blue or brown eyes. |
 | | The total number of genes in a human, according to estimates published in 2001 by the Human Genome Project, is thought to be between 27,000 and 40,000, distributed between the 46 chromosomes in each human cell. |
 | | In modern genetics, the gene is identified either with the cistron (a set of codons that determines a complete polypeptide) or with the unit of selection (a Mendelian gene that determines a particular character in the organism on which natural selection can act). |
| encyclopedia.farlex.com /gene (625 words) |
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