Complex sentence: In genetic genealogy the mutations considered to be UEPs can be any germline mutation usually single-nucleotide polymorphisms--the replacement of one letter by another in the DNA sequence, and the terms UEP and SNP are often loosely used interchangeably.
Split into simpler sentences: In genetic genealogy, the mutations considered to be UEPs can be any germline mutation. They are usually single-nucleotide polymorphisms (SNP)--the replacement of one letter by another in the DNA sequence, and the terms UEP and SNP are often loosely used interchangeably.