For the curious, Y-chromosomal Adam, the patrilineal most recent common ancestor of all currently living humans, is estimated to have lived 200,000 to 300,000 years ago.
Yes indeed. And that is only possible because Mitochondrial Eve is merely the most recent common ancestor in a strict matrilineal line - not our most recent common ancestor.
But... she lived more recently than 200,000 years ago. Doesn't that make her our most recent common ancestor, since all living humans have her as an ancestor and Y-chromosomal Adam lived further in the past?
The Old Copper Complex of the Great Lakes region considerably predates the Vinca Culture, with the first examples of the culture, and the copper tools associated with it appearing at around 7,500 BC. Granted, the Old Copper Complex was working with effectively pure native copper nuggets, and were just cold-smelting it into shape, considerably easier than processing it from ore and requiring way less in the way of actual metallurgical knowledge, but they were directly working with the metal well before the Vinca culture did.
I wish that quizzes could be manually reordered in series, particularly this one, because since this series’ quizzes are not in chronological order, such as the AD and BC quizzes alternating and the Stone Age being at the bottom, right after the 21st century. It really messes with my OCD and for quiz takers just trying to find the next quiz chronologically in the series.
Technically, we're still in the current ice age, because permanent continental ice caps remain on Greenland and Antarctica. The start of the Holocene ~10k years ago was the end of the last glacial maximum, and the beginning of the current interglacial period.
Using the term ice age as it's used in this quiz is super common and universally understood, so it's up to QM whether that level of "um, actually" even matters.
The Mitochondrial Eve clue is wrong. Mitonchondrial Eve is the last woman we all descend from in *strictly matrilineal line*, which means only through women. There may have been (and very probably have been) any number of much more recent common ancestors who we descend from through both men and women. This is also why "Y-chromosomal Adam" is not the mate of Mitochondrial Eve.
Ohhh okay, I think I see what you're saying. So, for example, there could be a man who lived 40,000 years ago, who had two daughters. One of those daughters migrated far away. Today, everyone would be descended from at least one daughter, but neither daughter is an ancestor to everyone. But we wouldn't know of this man because his genes weren't passed down through a Y-chromosome, and because neither of his daughters are mitochondrial eves?
Are you confident that people like this very probably exist just because it's more likely for someone with multiple children to have at least one child of another sex rather than all children of their own sex? Or is there something else I'm missing?
Yeah it's completely implausible that the most recent female line ancestor would also be the most recent ancestor. The odds of that are insanely low.
Also Mitochondrial Eve lived long before Y chromosome Adam, because male lines tend to die long before female ones. Males are more likely to have many or no children, whereas females are likely to have a smaller but non-zero number of children. Therefore it took longer for all the other female lines to die out leaving Mitochondrial Eve's as the remaining one.
I actually own a beautiful piece of native copper from Michigan.
Using the term ice age as it's used in this quiz is super common and universally understood, so it's up to QM whether that level of "um, actually" even matters.
Are you confident that people like this very probably exist just because it's more likely for someone with multiple children to have at least one child of another sex rather than all children of their own sex? Or is there something else I'm missing?
Also Mitochondrial Eve lived long before Y chromosome Adam, because male lines tend to die long before female ones. Males are more likely to have many or no children, whereas females are likely to have a smaller but non-zero number of children. Therefore it took longer for all the other female lines to die out leaving Mitochondrial Eve's as the remaining one.