*Unit 7 Part 1: Natural Selection Flashcards
Evolution
Evolution
A change in genes of a population over time
Theory of evolution
Life has changed over time
Which theory states that life has changed over time?
The theory of evolution
Lamarck
~Invented the theory of use and disuse
~Believed any physical alterations that make an organism better suited to its environment would be passed on to its offspring
Theory of use and disuse
~Invented by Lamarck
~Stated that organisms could pass on acquired characteristics
~Discarded due to lack of evidence
~Ex. giraffes gradually stretch necks over lifetime, passing these stretched necks to offspring
Charles Darwin
~Served as naturalist on the voyage of the HMS Beagle, 1832-1836
~Collected specimens from the galapagos islands (a set of relatively young volcanic islands off the coast of ecuador
~Published book “On the Orgin of Species” in 1859
~Proposed the theory of natural selection in his book
_____ is the driving force behind evolution.
Natural selection
Natural selection is the driving force behind _____.
evolution
Evolution only selects the fittest traits that arose through…
random variation (mutations and sexual reproduction).
Is the following statement true or false?
Organisms cannot evolve because they need to change.
True
List words to avoid when talking about adaptations.
~Need
~Want
~Try
~Had to
Sexual selection
Traits selected for mating success
Theory of natural selection
- Variation
~Random differences between indiviuals in a population - Struggle for existence
~More indiviuals are born than can survive - Survival of the fittest
~Indiviuals with favorable variations are more likely to survive and reproduce - Descent with modification
~The most “fit” organisms have the most offspring
The theory of natural selection is how populations adapt to…
environments over long periods of time.
