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Name: Laleena
Status: Student
Grade:  Other
Location: N/A
Country: Pakistan
Date: March 2009

Are the genes present everywhere on chromosome, or on specific regions?

They CAN be anywhere-almost. There aren't any genes on the tips of the chromosomes in areas called telomeres, or in the area that holds the sister chromatids together called the centromeres. Other than that, genes can be found anywhere. But only 1.5% or so is protein coding genes, the rest of the DNA is non-coding or codes for RNA genes, or is regulatory. Each chromosome has a different distribution of those genes.


The evidence is that each human chromosome is comprised of one long DNA molecule made up of approximately 100 million base pairs. Regions that code for a protein (a gene) can be located anywhere along the chromosome, but it appears that 90% of the DNA does not code for anything, so-called "junk" DNA (e.g. introns).

Ron Baker, Ph.D.

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