1 Chromosome
1 Chromosome is the largest human chromosome. People normally have two copies of this chromosome as all other non-sex chromosomes. Chromosome one spans 247,199,719 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 4,220 known genes in this chromosome which represents about 8% of all DNA in cells.
There are 890 known diseases related to this chromosome. Some of these diseases are deafness, Alzheimer, Glaucoma and Breast Cancer. Rearrangements and mutations of chromosome 1 are prevalent in cancer and many other diseases. Patterns of sequence variation reveal signals of recent selection in specific genes that may contribute to human fitness, and also in regions where no function is evident.
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