Populations and Evolution
A population is a group of individuals of the same species. Can the percentage of individuals with certain traits change because the environment changes?
Yes, because individuals with helpful traits are more likely to survive and reproduce.
What is DNA?
The molecule that carries genetic information in living organisms.
What is amplitude?
The height of a wave from the resting position to the crest.
What are fossils?
Preserved remains or traces of ancient life.
Population
A group of individuals of the same species living in the same area.
Differences in traits that exist among individuals of the same species.
variation
What is a mutation?
A change or mistake in the DNA sequence.
What is frequency?
The number of waves that pass a point per second.
What is the bottom layer?
The oldest fossils are usually found here in undisturbed sedimentary rock layers.
Natural Selection
The process where individuals with helpful traits survive and reproduce more.
A process where individuals with helpful traits survive and reproduce more successfully.
natural selection?
What causes skin cancer?
UV light damages DNA, leading to uncontrolled cell growth.
What is refraction?
The bending of light when it enters a new medium and changes speed.
What is relative dating?
A method that compares the ages of rock layers without exact dates.
Mutation
A change in the genetic sequence of DNA.
When a trait becomes more common because it helps organisms survive in their environment.
adaptation
What is cystic fibrosis?
A disease caused by a deletion of three DNA letters that affects mucus production.
How does increasing a sound wave's frequency affect the sound?
It makes the pitch higher (squeakier).
What is a mass extinction?
The event 66 million years ago that caused the extinction of non-avian dinosaurs.
UV Light
Radiation that can cause cancer by altering DNA sequences.
What is the accumulation of beneficial traits over many generations?
The reason populations today can look very different from their ancestors.
CF is seen in a higher percentage of people today than 200 years ago. Which explanation is most likely?
People are eating more foods that cause genetic deletions.
How does increasing a sound wave's amplitude affect the sound?
It makes the sound louder.
What is absolute dating?
A dating method that gives a specific age range using radioactive decay.
Absorption
When light energy is taken in by a material (makes things look dark).