Evolution/Final Slides Flashcards
(47 cards)
Microevolution
The evolution of a species or populations
Macroevolution
The evolution of a whole taxonomy group or speciation
Speciation
Origin of new species
Reproductive Barries occur when
Biological factors prevent breeding
Habitat Isolation
Species rarely see each other
Temporal Isolation
Species mate at different times
Behavioral Isolation
Species have different courtships
Mechanical Isolation
Species do not mate the same way
Gametic Isolation
One species sperm will not fertilize another species egg
Extinction
The failure of a species to adapt to environmental changes
Artificial Selection
Human imposed selection ex-breeding dogs
Operates the same as natural selection
Allows for faster evolutionary changes
Directly Observing Evolutionary Change
Evolution can happen faster so observations are easier
Fossil Record
Provides evidence for
- ancient life
- extinction
- origin of new species
- changes of species
ex- dinos to birds
Homology
Similarities from common ancestor
Molecular Homology
Genes passed down
Anatomical Homology
Features passed down from ancestor
Vestigial Structures
Features that ancestors needed that are not useful to current species
A Theory
is an explanation of the natural world backed up by evidence
A Hypothesis
is a testable statement
Darwin defined evolution as
Descent with modification
Species
gradually change over time
descent with modification
explains life unity and diversity
The gradual change from ancestral type
Natural selection
the most adapted species has a better chance of survival and reproduction that a less adapted phenotype has
adaptation
Changing to up the chance of survival and reproduction
