The total number of genes is estimated at
25000 much lower than previous estimates of140000 that had been based on
extrapolations from gene-rich areas as opposed to a composite of gene-rich and
gene-poor areas.Almost all (99.9%) nucleotide bases are exactly the same in all
people. Functions for over50% discovered genes are not known yet. Scientist
have identified about 1.4 million locations where single-base DNA difference
(SNPs or Single Nucleotide Polymorphisms)occur in humans.
This information promises to revolutionize
the processes of finding chromosomal locations for disease-associated sequence
and tracing human history.
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