Chromosome 9 is one of the 23 pairs of
chromosomes in
humans. People normally have two copies of this chromosome. Chromosome 9 spans about 145 million
base pairs of
nucleic acids (the building blocks of
DNA) and represents between 4 and 4.5 percent of the total DNA in
cells.Identifying
genes on each chromosome is an active area of genetic research. Because researchers use different approaches to predict the number of genes on each chromosome, the estimated number of genes varies. Chromosome 9 likely contains between 800 and 1,200 genes.
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