A Y-SNP is a single nucleotide polymorphism on the Y-chromosome.
A deletion is when one or more base pairs is subtracted from the genetic code. For example, AGA might be subtracted from GATAGATA with the result now reading GATTA.
DNA testing or genetic testing is any test that uses DNA to determine medical traits, genealogy, or ethnic origins. Some companies are using it for lifestyle testing.
A Y-STR is a Short Tandem Repeat marker on the Y-chromosome.
A binary polymorphism i a genetic change with two possible states.
The Ancestry V2 chip is Ancestry.com’s second microarray chip. It is a custom version of the Illumina OmniExpress Plus Genotyping BeadChip. It’s their current chip.
The Ancestry V1 chip was Ancestry.com’s first microarray chip. It was a standard version of the Illumina OmniExpress chip Genotyping BeadChip.
The 23andMe V4 chip is 23andMe’s fourth microarray chip and is the one now in use. It replaced their V3 chip in November 2013. It is a completely custom Illumina Genotyping BeadChip.
The 23andMe V3 chip was 23andMe’s third microarray chip. It replaced their V2 chip in January 2011. It was a custom version of the Illumina OmniExpress Genotyping BeadChip. One of its key features was backwards compatibility with their V2 chip.
The 23andMe V2 chip was 23andMe’s second microarray chip. It is almost surely the Illumina HumanHap550 Genotyping BeadChip.