2.4.11 by Jessie V.

TEST MOST LIKELY THIS COMING THURSDAY!!!

Homework:

*unit packet pages 33-36

*19.2 just reading due Tuesday

Extra Credit:

*bring M and Ms Monday

*objectives due on day of test

*unit packet pages 25-26

Due to 2 snow days, biology was mostly notes. We took notes in the packet called To Be Or Not To Be Evolution. Here is what we learned

I. ANCIENT EARTH

A. Atmospheric condition

1. Gases-Large% carbon dioxide (CO2), nitrogen (N2), water vapor (notice no oxygen).

2. Miller-Urey Experiment-synthesized(made) complex organic molecules by mixing and electrically stimulating a mixture of gases.

-amino acids produced.

skip number 3 and move onto part B.

B. The First Cells-

4.6bya-Earth was born.

4.0bya-earth began to cool.

(skip all the way down to 1.5bya).

1.5bya-eukaryotic cells, sexual reproduction, increased genetic diversity.

1.3bya-multicellular organisms.

skip and move down to part C.

C. Age of Earth

a. Formation of Earth-4.5 billion years ago

b. Relative Dating(UP23)-Fossil layers

That was it for part I. We then moved to part IV.

IV. TYPES OF MACROEVOULUTION
1.Gradualism-one species gruadually changes into a new species.

2.Divergent Evoulution or Speciation:

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

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

b.Process that need to occur:

Geographical Isolation-members of a species is separated from others due to physical barriers.

Reproductive Isolation- species are separated by the ability to reproduce.

3. Punctuated Equilibrium-

tempo of speciation: graudual vs. rapid. helped explain the non-gradual appearance of species in the fossil record.

(No examples)

4. Convergent Evolution:

a.Definitions- when 2 sperarte species develop similar adaptation (phenotypes) through differnet evolutionary trees.

b.examples-Sharks and Dolphins.

After we finished taking notes we then had time to work on the homework which was the UP pages 33-36 (like what it says up under homework).

the next person is Fox!!!!