Early Ideas &
Darwin's Voyage
Darwin's Voyage
On which islands did Darwin observe natural selection in giant land tortoises? (Spelling counts!)
Galapagos
Heritable differences that exist in every population
Variations
The study of the distribution of species around the world
biogeography
A measurement of how common a certain allele is in the population
allele frequency
Change over time
evolution
What are the two different types of species we discussed that Darwin observe while at the Galapagos Islands?
The Turtles and Finches
Any trace or remains of a once-living organsim that has been preserved by natural processes.
fossil
Movement of alleles between populations
gene flow
The process in which some organisms have variations that are beneficial in their environment and are able to survive and pass their genes onto their offspring.
Natural selection
Individual who proposed that changes in the environment caused an organism’s behavior to change, which lead to great or lesser use of a structure or organ. This hypothesis was later proven incorrect.(Giraffes Neck)
Lamarck
Features inherited from ancestors but which have lost much or all of their original function
vestigial structures
A type of genetic drift when an event drastically reduces population size.
bottleneck
A group of genetically similar organisms that can mate and produce fertile offspring.
species
A process in which humans modify a species by breeding individuals with traits that we find desirable or useful
artificial selection
Features that are similar in structure, but are found in different organisms and likely have different functions. (spelling counts!)
homologous structures
When members of different populations are so different that they can no longer mate successfully - the final step of speciation.
Reproductive Isolation
A change in the gene pool of a population due to chance
Genetic Drift
A measure of the ability to survive and produce more offspring relative to other members of the population in a given environment.
Fitness
Comparison of DNA & amino acid sequences between species
Genetics & Molecular biology
A prezygotic barrier in which two species breed at different times (seasons, times of day, years).
Temporal isolation
An explanation of events in the natural world based on observations. Unlike a scientific law, this can be falsified or changed.
Scientific theory