Unit 1
The definition of scientific theory
An explanation for observable phenomena.
Cells make up
All organisms
The passing of traits from parent to offspring
Heredity
Earth is about ___ years old
4.5 billion
Genetic Engineering
Changing an organism’s genes by using DNA technology
The Big Bang Theory
How the universe formed
Cell theory was first put together in
1838
DNA molecule shape
Twisted ladder
Precambrian Era; First extinction was caused by ____
Increase in Oxygen
Gasoline and diesel are both ___
Fossil fuels
Matter is...
Anything with mass that takes up space
Plants go through the _____ process
Photosynthesis
Humans have __ pairs of chromosomes
23
During this era the land masses grouped together forming Pangea
Paleozoic era
Genetic screening
A type of medical test that looks for changes in chromosomes, genes, and proteins