Variation Nation
What is “variation”?
Differences between individuals.
What is natural selection?
Process where helpful traits survive.
What is an adaptation?
A helpful trait for survival or reproduction.
What is the fossil record?
Layers of rock showing how species changed.
When is your next test?
12/19
What two main factors cause variation?
Genetics and environment.
Who is the “selector” in natural selection?
The environment.
What is the difference between short-term survival and adaptation?
Adaptation happens over generations.
What are homologous structures?
Body parts with the same structure but different functions.
What is the capital of California
Sacramento
Give an example of an inherited trait.
Eye color, hair type, etc.
Example: Why do giraffes have long necks?
To reach food and survive better.
What does “fit for the environment” mean?
The organism’s traits match its surroundings.
What is a vestigial structure?
Body part no longer used but shows history.
After Thanksgiving
Why is variation important for survival?
It allows some individuals to survive changes.
What happens to traits that don’t help survival?
They become less common.
Give one example of an animal adaptation.
Camouflage, thick fur, webbed feet, etc.
What does DNA evidence show?
How closely related species are.
Soccer
How does sexual reproduction create variation?
It mixes genes from two parents.
How can a drought affect natural selection?
Changes food supply, so certain traits help survival.
What is a population?
A group of the same species in one place.
What can fossils tell scientists?
When and how species changed over time.
Where are the 2028 Summer Olympics going to be held?
Los Angeles