Mechanisms of Evolution
Animals that are better adapted, or the fittest, survive and pass on their genes to the next generation.
What is Natural Selection?
A reduction in gene flow leads to this.
What is speciation?
Natural selection relies on these advantageous traits.
What is adapatation?
A group of organisms that can breed with each other.
What is a species?
A dog's paw, a human arm, a bat wing, and a whale flipper.
What is a homologous structure?
A random change in the genes of an organism that is passed down to offspring.
What is genetic mutation?
When species arise in the same geographical area. The orcas in the pacific north west are an example of this.
What is sympatric speciation?
Having a characteristic that has the same function due to environment, but has a different structure.
What is an analogous structure?
A chance event that wipes out a large portion of the population leaving a random sample of the population behind.
What is Genetic Drift?
When species become geographically isolated. The Arizona squirrels are an example of this.
What is allopatric speciation?
A way to show how closely related two organisms are.
What is a phylogenetic tree (or cladogram)?
The sharing or mixing of genes between organisms that increases genetic diversity.
What is a Gene Flow?
Organisms that have distinct genetic differences, but can still interbreed.
What is a sub species?
In embryology, embryos are very similar to each other. This shows that species have a ________________.
What is a common ancestor?