Intro To Evolution
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What evolve?
Populations not individuals
Evolution?
Change In the heritable traits of a population over time
Evolution happens over?
The long term
What does studying evolution help us understand?
Where we came from as humans and to help us understand the natural world
Artificial selection?
The process where human brigs decide which organisms to breed in order to create desired traits
What are the most common breeds that humans artificially select?
Dogs, cattle, crops, and ornamental plants
What was popular both in Darwin’s time and today?
Artificial selection
What does artificial selection create changes in?
Populations of organisms
Why is artificial selection done?
To be pleasing to humans
What are some draw backs to artificial selection?
Not necessarily good for the organism ex. Pure bred dogs have increased diseases - modern tomatoes have good size, shape and color but no flavor
What happened in 1665?
Robert Hooke described the first “cells” by examining cork bark under a microscope
What happened in 1668?
Antony can Leeuwenhoek described many animal cell types I.e- blood cells, sperm cells and algae
What happened in the 1800’s?
Scientists agree that all organisms consist of cells
1858?
Darwin and Wallace release findings about evolution
What did Darwin wrote?
Origin of species
Life is a product of ?
Continuous change
All species arose from a
single common ancestor
Darwin developed theory of
Natural selection
Organisms with the best traits for survival have a reproductive advantage;
This allows them to pass their traits on to their off spring
What happened with cells in 1858
Deff if a cell was developed as well as theory
What’s cell theory
All organisms are composed of cells- all cells arise from existing cells
Population
A group of individuals of the same species living in the same area at the same time
Trait-
A distinguishing feature I an organism
Natural selection
The process by which individuals with certain heritable traits are better able to survive and reproduce, compared to other members of the population; process by which individuals are naturally selected