evolution Flashcards
what can evolution occur in?
animals, plants, bacteria, and all living organisms.
what is the definition of evolution?
any change in the genetic traits in a population over many generations.
what was Lamark’s theory of evolution?
Characteristics that were NEEDED would develop during an organism’s lifetime then passed on to their offspring.
What was Charles Darwin’s theory of evolution called?
Natural selection
What was Charles Darwin’s evolution theory about?
new species come from a pre-existing species and share a common ancestor.
What are the four steps of Natural selection?
- Variation
- Selection pressure
- Reproduction
- Evolution
What is variation?
a difference in traits between individuals of the same species.
What is selection pressure?
a challenge that impacts the organisms ability to survive in a particular environment.
What is reproduction?
an individual with the favored phenotype is more likely to reach reproductive maturity.
what is convergent evolution?
When a species does not share a common ancestor but share similar features.
What is divergent evolution?
. Species share common ancestor.
. Similar DNA sequence
. Species can change overtime and separate into new forms.
What is artificial selection + selective breeding?
Humans selecting for desirable traits rather than leaving the species to evolve gradully without human interference
what is the definition of a species?
group of organisms that can breed to produce fertile offspring is called a species
what is speciation?
the formation of a new species
