A group of people descended from the same ancestor is a family or a bunch of relatives. Sometimes, if more organized, they may be called a clan or a tribe.
clan
A group of people all descended from the same ancestor may be called a family, a clan, a tribe, or a people, depending on the context.
A clan.
A group of people who share the same ancestors, culture, language, or religion is commonly referred to as an ethnic group.
Apes and humans descended from the same common ancestor.
A group of relatives, a family with the same ancestors.
species
If you go back far enough, all dogs are descended from the same canine ancestors. The development of breeds is a much more recent development in a time line.
An ethnic group is a community or population that shares a common cultural background, heritage, language, or ancestry. Members of an ethnic group often identify with one another based on these shared characteristics and may have a distinct sense of belonging or identity.
tribe
A group of people descended from the same ancestor is a family or a bunch of relatives. Sometimes, if more organized, they may be called a clan or a tribe.
The majority of Tajiks are descended from the same ancestors as modern day Iranians. They are Persians, unlike their neighbors most of whom are Turkic. There are some Tajiks who still bear the features of Alexander the Great's invading armies, blue eyes and red hair.