23andMe began offering direct-to-consumer genetic testing in November Customers provide a saliva testing sample that is partially single nucleotide. Humans have 23 pairs of chromosomes (46 chromosomes total) distinguished by their unique size and shape under a microscope. They are numbered from 1 to The 23rd pair of chromosomes are two special chromosomes, X and Y, that determine our sex. Females have a pair of X chromosomes (46, XX), whereas males have one.
This test looks for changes, or abnormalities, in the chromosomes that make A person typically has 23 pairs of chromosomes in each cell (23 pairs = * 23andMe's Health + Ancestry Service provides genetic testing that includes: 10+ Health Predisposition* reports including: Type 2 Diabetes (Powered by 23andMe. This test can show if your child was born with the usual number of chromosomes or if the size or structure of the chromosomes are different. This test does not.