The invention provides nucleic acid sequences that are complementary, in one embodiment, to a wide variety of human polymorphisms. The invention provides the sequences in such a way as to make them available for a variety of analyses including genotyping a large number of SNPs in parallel. The invention also provides a collection of human SNPs that is useful for genetic analysis within and across populations. As such, the invention relatesd to diverse fields impacted by the nature of genetics, including biology, medicine, and medical diagnostics.