B1 is the second most common maternal lineage in breeds of European or American origin. (embarkvet.com)
Scientists examined mitochondrial DNA, which is passed from mothers to offspring, to trace maternal lineages of ancient and modern dogs and wolves. (sciencenews.org)
Overall, the study's data from mitochondrial DNA — different from nuclear DNA in that it helps scientists trace maternal lineages — reveal that population structure in humpback whales is largely driven by female whales that return annually to the same breeding grounds and by the early experience of calves that accompany their mothers on their first round - trip migration to the feeding grounds. (sciencedaily.com)