In genetic genealogy, the Most Recent Common Ancestor (MRCA) is the ancestor shared most recently between two individuals.
Mitochondria are specialized subunits (organelle) within cells. In humans, mitochondria are responsible for cell respiration and for producing energy. They evolve into their current state from separate organisms that form a mutually beneficial (symbiotic) relationship [...]
A marker is a physical location (locus) on the chromosome. The term is often used colloquially in genetic genealogy to refer to a short tandem repeat (STR). For example, "The Y-DNA67 test is a panel [...]