Scribepost Friday 2.4.11

Announcements: **Extra credit pages 24-25 in UP, bring in M&Ms (all due Monday), Objectives due Friday

Homework: UP 33-36 due Monday, 19.2 (reading only) due Tuesday

Today we took notes most of class, from our To Be Or Not To Be note packet. These are the notes we took:

1. ANCIENT EARTH

1. Atmospheric Condition

1.Gases

Carbon Oxide, Nitrogen, water vapor (notice no oxygen)

2. Miller-Urey Experiment- Synthesized complex organic molecules by mixing and electrically stimulating a mixture of gases

1. The first cells-

4.6 bya- Earth was born

4.0 bya- Earth began to cool

3.5 bya- bacteria

1.3 bya- multicellular organism

1. Age of Earth

a.Formation of Earth

4.5 billion years ago

b. Relative Dating (UP23)

geologic time scale/ deeper layers are older than surface layers

(skip to IV.)

1. TYPES OF MACROEVOLUTION

1.Gradualism

one species gradually changes into a new species

2. Divergent Evolution or Speciation

a. Definition- development of 2 or more species from a common ancestor

Adaptive Radiation- a habitat opens up that permits many new niches to be occupied allowing many variations to survive

b. Process that needs to occur:

Graphic Isolation- members of species separated

Reproductive Isolation- species that are separated by ability to reproduce

3. Punctuated Equilibrium- Tempo of speciation: gradual vs. divergence in rapid bursts; helped explain the non-gradual appearance of species

Convergent Evolution-

a. definition- when 2 separate species develop similar adaptations through different evolutionary trees

b.examples- sharks and dolphins (mimicry)

After taking notes, Mr. Paek let us start our homework.

***Next poster will be Star.***