Human Evolution Flashcards
How have biologists and anthropologists understood what happened before written history
Through cultural artifacts, fossils, comparison of human traits with other primates , and DNA similarities among living humans and other primates.
How many pairs of chromosomes does DNA carry.
23 pairs
Where theirs malls pieces of DNA.
In the mitochondria
How does the mitochondria dna passed passed on
It passed on by the mother
By comparing dna patterns what can chemist detect
They can detect any new mutations that have been added beeen added to the small piece of original mitochondrial DNA
What happens if a group of humans split off from a common ancestral group
Both group begin to accumulate different mutations from each other,each group is genetically separated from the other group
What is the best way of knowing that two groups have separated in the past
By counting the number of new mutations found in the dna of one group and not found in the dna of the other group
The greater the number of different mutations
The longer the amount of time that the two groups have been separated from each other.
Do mutations take a long time to happen
True
If the dna of two groups is quite similar
Then they have not been separated very long
Witch two groups are the most similar
North Asia, and Native American
Which one of the three groups is the most different from the other two groups?
Asia
So which group has been separated from the others for the longest time
Africa
Which two groups haven’t been separated from each other for very long
North Asia, and Native American
How many years does it take for 1% of mitochondrial dna to be change mutation
500,000 years
