Name __________________________________

Quiz 3 – 2/16/07 (10 points)

1) Give approximate dates (closest 10,000 years ago) for the following:

- Earliest date for modern human fossils in Africa - ~160,000 years ago

- Earliest date for modern human fossils outside Africa/Middle East - ~92,000 years ago

- Earliest date for modern human fossils in Europe - ~40,000-30,000 years ago

- Earliest date for modern human fossils in the Americas - ~10,000 years ago

- Earliest date that anatomically modern humans were the only hominids on the planet – ~28,000 years ago

2) What is the approximate level of genetic diversity within and between human populations worldwide?

Within - ~90%

Between - ~10%

3) Explain one problem with a biological definition of race.

- Most genetic variation among human populations occurs within populations, not between them

- Human biological variation is distribution continuously around the world, at least when sufficient populations and individuals are sampled

- Human biological variation is discordant, i.e. many traits vary independently of one another, possibly in response to selection or genetic drift