Evolution 1 - Introduction to Evolution Flashcards
What are the 2 common meanings of Theory? (2 points with a total of 4 subpoints)
- Everyday meaning = an educated guess.
a. In science, that is called a hypothesis or prediction. - Scientific meaning = an explanatory model that accounts for a VERY large body of evidence.
a. Cell Theory
b. Atomic Theory
c. Theory of Gravity
What is a scientific theory founded on?
Unlike tentative guesses, a scientific theory is found on a large body of evidence that gives scientists great confidence in the theory
What does a scientific theory being founded on a large body of evidence, which gives scientists great confidence in the theory, not mean?
It does not mean that these theories are complete or perfectly accurate.
What are all scientific theories considered as?
Tentative and open for revision and refinement as new evidence is gathered.
Even though all scientific theories are tentative and open for revision and refinement as new evidence is gathered, what would scientists be shocked to find? (3 points)
-An animal without DNA.
-An atom without electrons.
-Or an apple that “fell up.”
What does it mean when something is a fact?
It suggests that it is absolute, and not subject to change.
What does science not like?
Absolutes
What is the definition of a fact?
An observation that has been confirmed repeatedly and is accepted as true (although its truth is never final)
What term do scientists prefer to use?
Observations
Write how it change the tone of sentences that describe how the sky is blue. (2 points)
- It is fact that the sky is blue.
- I observe the sky is blue.
Evolution Definition
The cumulative change in the heritable characteristics of populations that occurs over successive generations.
Who cannot evolve?
Individuals cannot evolve?
Why can’t individuals evolve?
Individuals cannot change their genes.
Who can evolve?
Populations are the smallest unit that can evolve.
Why can populations evolve?
Populations can have a shift in their gene pool.