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Chapter 11: Evolution

Across
A change in allele frequency caused by movements in and out of a population
All of the alleles found in a population
A type of evolution where unrelated organisms evolve similar structures because of similar environments
When a few individuals leave a source population to form a new population (2 words)
Genetic drift that occurs (usually) after a catastrophic event
When one species quickly speciates into many
Structures in different organisms that look similar and share a common ancestor
The first requirement for natural selection is that there must be ______ in a trait.
The vast variety of living things
Animals that Darwin observed that led him to propose a theory of evolution by natural selection
Down
One of the men who independently came up with the theory of evolution by natural selection; based on observations made in Indonesian Islands
A mechanism of evolution that is always stronger in small populations
A random change in an individual's DNA
The physical movement of individuals (and therefore their alleles) from one area to another
Genetic drift that occurs when a small group of individuals leave their population and move to a completely new area
The process by which evolution most commonly occurs
A characteristic that helps an organism survive in its current environment
Speciation that occurs as a result of geographic separation