Evolution Flashcards
Evolution theory over time (people)
Lamarck (simple) -> Darwin (branched) -> Wallace(closely related species)
darwin and wallace mindset
-“population thinking”
variation among individuals in populations
-Natural selection
Evidence of evolution
- Fossils
- Transitional Traits
- Vestigial Traits
- Homology
Transitional Traits
trait found in a fossil that in intermediate between those of ancestral forms and derived species
Vestigial structures
traits that have little to no function bc it’s reduced, but is similar to traits that do function in others
Homology
a trait that’s common among different organisms and comes from the same ancestor
Types of Homology
a) Genetic Homology
b) Developmental Homology
c) Structural Homology
The variation in traits mentioned arises __________________
at random
Does Natural Selection create variation?
No- it edits it!
Natural selection acts at the ____________ (individual)
level of the phenotype
Is evolution seen per individual?
No, it’s seen in the population
Fitness
the ability of an individual to produce surviving offspring (relative to others in the pop.)
Adaptation
Heritable trait that increases the fitness of an individual in an environment relative to the others lacking the trait
Premises of NS (1)
- Individuals in a pop. vary in their characteristics
Premises of NS (2)
- Some of the variation among individuals is heritable
