1. Principles of Biology
By: Alan, Ryan, Julien

2. Four Principles of Biology
Biology is based off of these four theorems or principles which help guide the rest of biology
Gene theory:The idea that characteristics of living organisms are controlled by genes
Cell Theory: The base that everything living is made of cells
Homeostasis: The maintaining of a stable internal environment
Evolution: The change in the characteristics of living things over time

3. Gene Theory
The Gene Theory is a theory that states that characteristics of living organisms are controlled by genes
These Genes are passed from parent to child
Gene= a Segment of DNA
It has instructions to encode a protein
Genes are located on larger Structures called Chromosomes
Chromosomes are found inside every cell
Chromosomes contain DNA Molecules
Molecules of DNA are encoded with instructions that tell cells what to do

4. Pictures of a Chromosome, and DNA Structure

5. Cell Theory
The cell theory says that all living things are made up of cells
A cell is the structural unit of a living organism
Cells can only come from another cell
Each living thing begins life as a cell
Some things like bacteria live their entire life as a single cell
Other things become multi-cellular like us
Each of us have trillions of cells inside our body

6. Homeostasis
Definition of Homeostasis - refers to the ability of the body or a cell to seek and maintain a condition of equilibrium or stability within its internal environment when dealing with external changes.
Example - Human Internal Body Temperature

7. Evolution
Definition of Evolution - the change in the characteristics of living things over certain periods of time
Stayed by Charles Darwin
His theory states that Evolution occurs by a process called Natural Selection
This theory states that organisms adapt to their environment to survive and produce more offspring in the future

8. Adaption
Adaptation is when an animal's gains an advantage to better help it survive in the environment
The difference between adaptation and evolution is that adaptation can happen without evolution

9. Questions (Prize is candy)
About how many cells does one person have in them?
What two things does the cell theory state? Two people answer
What do each of us start out as?
What are the 4 main principles of Biology? Four people answer
What is a gene?
Where are Genes located?
What is adaptation?
Who invented evolution?
What is evolution?
What is homeostasis?
What is DNA?

10. THANK YOU FOR LISTENING
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