← Biology 122 Test
5 Written Questions
5 Matching Questions
- Phylogenetic species concept
- Phylogenic tree
- the theory of evolution by natural selection was revolutionary because?
- transitional feature
- a a trait in a fossil species that is intermediate between those of younger and older species.
- b it overturned the typological thinking and that species were unchanging, it was scientific and could be experimented on an tested
- c the smallest diagnosable monophyletic group of populations, they are related by most characteristics and DNA. These groups are based in statistical differences in the traits which are used to estimate phylogeny.However,What characters should we use to base our phylogeny on
How much divergence from a trait constitutes a species ? 1% or 10% etc,It is often difficult to distinguish between gene trees and species trees.
- d increases the completeness of our knowledge and possesses maximum and robust explanitiory power.
- e depicts the pattern evident in the history of decent groups of organisms it's more of a hypothesis.
5 Multiple Choice Questions
- directional selection, stabalizing selection, disruptive selection.
- the observation that data from independent sources agree in supporting predictions made by a theory. such as fossils supporting a hypothesis
- changes in gene frequency within population and species
- a comprehensive theory of evolution that incorporates genetics and includes most of Darwin's ideas, focusing on populations as the fundamental units of evolution.
- extinct species in the fossil record were succeeded in the same region by similar species
5 True/False Questions
does natural selection change individuals → no just populations
allele → variant forms of a gene
Parsimony → 550-250 million years ago means anchient era most phla appeared and diversity was booming, major events were the first arthapods land plants fish animals with jaws tetrapods and reptiles ended by permian extinction
population thinking → change in allele frequencies over time
Stabilizing selection → moved the average value of a trait from one direction to another or the extreme expression of a trait leads to great fitness so much so that the opposite expression of the trait dissappears or shifts toward the other trait. this is a guided selective process such as dog breeding moving the species in a direction we wanted them to move. This can result in problems.