Pop Gen Daily

Darwin's Finches became separate species due to

• Geographic isolation

• Temporal Isolation

• Behavioral Isolation

• Postzygotic Isolation

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The term for the formation of new and distinct species over the course of evolution is...

• speciation

• biological species concept

• reproductive barrier

• natural selection

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What is genetic drift?

• The movement of genes in/out of a population
• A small, random change in the DNA
• Any change in the allelic frequencies in a population that is due to chance
• ›The process in which humans select for or against particular features in organisms

What type of selection is this?

• Directional Selection
• Stabilizing Selection
• Disruptive Selection
• Natural Selection

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When has speciation occurred?

• When populations no longer look the same
• When populations no longer have the same frequency of alleles
• When populations are living in different environments
• When populations can no longer interbreed

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Which is a mechanism for change in allele frequency?

• gene flow
• genetic drift
• natural selection
• all answers are correct

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The total collection of genes in a population at any one time.

• population genetics

• gene pool

• gene flow

• allele frequency

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What is a species? 

• A group of organisms that can mate with each other and produce fertile offspring. 
• A group of organisms that can mate and produce offspring even if those offspring are infertile.
• A group of organisms that genetically are very different from each other. 
• Indivual organisms that live in the same environment. 

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A flash flood carried a raft of Amazon ants away from their original population. There is enough distance between the two groups, that they will never meet in nature again. What type of reproductive barrier is this?

• behavioral isolation
• temporal isolation 
• gametic isolation
• geographic isolation 

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The change in the genetic make up of a population is called...

• Population
• Random mating
• Evolution
• None of these

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