B6- Evolution Flashcards
What is the primary concept behind Darwin’s theory of evolution?
Only the fittest survive
According to Darwin, what leads to the survival of certain organisms?
The most suitable characteristics for the environment
What happens to organisms that are less well adapted?
They are less likely to survive and reproduce
Over time, what happens to beneficial characteristics in a population?
They become more common
What is the term for the development of a new species?
Speciation
Fill in the blank: The theory of evolution by natural selection is now widely ______.
accepted
What role does genetics play in Darwin’s theory?
It explains how beneficial characteristics are passed on
What evidence supports the theory of evolution by natural selection?
Fossil record, genetics, antibiotic resistance in bacteria
What causes speciation?
Populations change enough to become reproductively isolated
What does extinction mean?
No individuals of a species remain
List one reason why species become extinct.
- Environment changes too quickly
- New predator kills them
- New disease kills them
- Can’t compete with another species for food
- Catastrophic event occurs
True or False: The Dodo is an example of a species that is currently extinct.
True
What is a consequence of a new disease on a species?
It may lead to extinction
Fill in the blank: The successful organisms are more likely to ______.
reproduce and pass on their genes
What does the fossil record show about species over time?
Changes in organisms developed slowly
