Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
25 Cards in this Set
- Front
- Back
|
Hybridization |
The crossing of two different species that share common genes
|
|
|
Directional Selection
|
Natural selection that changes the distribution of a trait to favor one extreme phenotype
|
|
|
Stabilizing Selection
|
Intermediate phenotype becomes more common in a population
|
|
|
Normal Distribution
|
A population that is not undergoing natural selection
|
|
|
Mutation |
A random change in the DNA of a gene which can cause genetic variation
|
|
|
Founder Effect
|
loss of genetic variation that occurs when a new population is established
|
|
|
Intrasextual Selection
|
Competition among the males to mate
|
|
|
Bottleneck Effect |
Genetic variation is lost - Disaster
|
|
|
Distributive Selection
|
Intermediate phenotypes or selected against both extreme phenotypes
|
|
|
Genetic Drift
|
Changes in allele frequencies within a population
|
|
|
Allele Frequency |
A measure of how commonly a particular allele occurs in a population
|
|
|
Speciation
|
Is the divergence of two or more species from an existing one
|
|
|
Behavioral isolation
|
A difference of chemical scents between two populations.
|
|
|
Genetic Mutations |
Are random |
|
|
Enzymes |
Increase the rate of chemical reactions
|
|
|
Divergent Evolution
|
Evolution towards different traits and closely related species
|
|
|
Mutations and Recombination |
Two main sources of genetic variation
|
|
|
Coevolution |
Species evolve in response to changes in each other
|
|
|
Collisions with asteroids in meteorites
|
Contributed to the intense heat of the Hadean eon
|
|
|
Lipid membrane hypothesis / Liposomes |
Act as barriers between organic molecules and the environment
|
|
|
The discovery that RNA can self-replicate
|
Supports the hypothesis THATRNA was the genetic material in the earliest organisms
|
|
|
Through the process of Endosymbiosis
|
Bacteria may have evolved into mitochondria
|
|
|
The Miller-Urey |
Demonstrated the energy from lightning might have help create earth's first organic molecules
|
|
|
Cyanobacteria |
Changed the earth by adding oxygen to the atmosphere
|
|
|
Cell walls
|
Found in plant cells, but not in animal cells
|
