Genetic Variation within Population
Natural Selection in Populations
Mechanisms of Evolution
Speciation through Isolation
Patterns in Evolution
100
The combined alleles of all of the individuals in a population.
What is a gene pool
100
Frequency is highest near the mean value and decreases towards each extreme end of the range
What is normal distribution
100
The movement of alleles from one population to another
What is gene flow
100
How does reproductive isolation result in speciation?

What is

By separating two populations so that they do not interbreed. Over time changes build up and the population may become two distinct species.

100
Why are mutation and genetic drift random events?

What is

They happen by chance, cannot be predicted.

200
A measure of how common a certain allele is in the population
What is allele frequency
200
The observable change in the allele frequencies of a population over time
What is Microevolution
200
Changes in allele frequencies that are due to chance
What is genetic drift
200
Reproductive isolation caused by a river is an example of

What is

Gepgraphic isolation

200
What are two types of relationship that can result from coevolution?

What is

Beneficial and Competitive relationships

300
A random change in the DNA of a gene
What is Mutation
300
Selection that favors phenotypes at one extreme of a trait's range
What is directional selection
300
Genetic drift that occurs after a small number of individuals colonized in a new area
What is Founder effect
300
Reproductive isolation caused by differences in the time of the day that mating happens is one type of

What is

Temporal Isolation

300
The evolutionary relationship between the bull-thorn and a specieis of stinging ant

What is

Coevolution

400
New allele combinations form in offspring
What is Recombination
400
When intermediate phenotypes are favored by natural selection
What is Stabilizing selection
400
Genetic drift that occurs after an event greatly reduces the population
What is Bottleneck Effect
400
How does reproductive isolation affect the gene pools of two or more populations?

What is

The gene pools become more and more different because there is no gene flow between them

400
The evolution of wings in birds and insects

what is

Convergent evolution

500
Two main sources of genetic variation
What is Mutation and Recombination
500
When both extreme phenotypes are favored by selection
What is Disruptive selection
500
Occurs when certain traits increase mating success
What is Sexual selection
500
Although snapping shrimp in the Atlantic and Pacific oceans look similar, they are distinct species that have evolved through ___________ _____________ separated by the Isthmus Panama.

What is

Geograpghic Isolation

500
Explain why evolution through natural selection is not random?

What is

Natural selection is not random - it can have direction and its effect add up over time. It favors traits that help a species  survive and reproduce.

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