22 Chromosome
The sequence of human chromosome 22 was completed in December 1999. An international consortium of sequencing centres released into the public domain the genetic code of the 33.5 million bps that comprise the euchromatic portion of human chromosome 22. Learn more about your family history with the Enhanced Maternal Lineage Test at GeneTree.com! Family Tree DNA to test your Y Chromosome...your Paternity Lineage Test
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22 Chromosome
is the first human chromosome to be sequenced. It represents between
1.5% and
2% of the total DNA in cells. People normally have two copies of this
chromosome as all other non-sex chromosomes. Chromosome twenty two spans about
50 million base pairs. Base Pairs are two molecules (nucleotides) on
opposite DNA strands that are connected. Adenine (A) forms a base pair with
thymine (T), as does guanine (G) with cytosine (C) in DNA. Base pairs is how DNA is measured.
There are about 742 genes in this chromosome.