Identify and study at least three human chromosomes and list the number of base pairs contained on each. For each chromosome, list several associated traits and disorders.



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Human cells have 23 pairs of chromosomes each.  22 pairs are autosomes (non-sex) and 1 pair are sex chromosomes.  The autosome pairs are numbered 1 through 22 and the sex chromosomes are labelled X and Y.  Chromosomes 1, 2, and 3 are listed below:

Chromosome 1 has 247,199,719 base pairs and 4,220 associated genes.  It is the largest human chromosome.  It also contains the most diseases associated with any single chromosome including deafness, Alzheimer's disease, and breast cancer.

Chromosome 2 has 242,751,149 base pairs and 1,491 associated genes.  It is widely believed to be the result of two chromosomes that fused together over time.  It also provides evidence for the evolution of humans and primates from a common ancestor.  Some diseases and traits associated with this chromosome are autism, Ehlers-Danlos syndrome, Waardenburg syndrome, and the development of intelligence.

Chrmomsome 3 has 199,446,827 base pairs and 1,550 associated genes.  It is associated with Castillo fever, cataracts, diabetes, and Protein S deficiency.

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