Beaudry

1
(No Transcript)
2
(No Transcript)
3
(No Transcript)
4
(No Transcript)
5
(No Transcript)
6
(No Transcript)
7
(No Transcript)
8
-Beaudry Joyce, Science, 1992
9
Frq. Of mutation ( n25) after 9 generations.
-Beaudry Joyce, Science, 1992
10
(No Transcript)
11
Life History

• Oldest rocks on Earth are approx. 3.8 billion
  years old.
• Time between solid Earth and first cellular
  forms of life 300 Million years!

Proterozoic
Archaean
Hadean
12
(No Transcript)
13
-Elena Lenski, Science, 1996