Inheritance of a mtDNA-linked trait

    Mitochondrial DNA (mtDNA) is a genome located in the extranuclear mitochondria. mtDNA is inherited through the maternal egg cytoplasm, with the father's sperm making no contribution. All children of the first affected woman are affected, including sons. However, only female children can pass the trait on, again to all of their descendants. MtDNA thus persists by being passed down the maternal lineage.

Homework: Write out the genotypes of every individual in the tree.

All text material ©2010 by Steven M. Carr