Exam 1 Review

Which is NOT a condition of Hardy-Weinberg equilibrium?

• No genetic drift

• Nonrandom mating

• No mutations

• No gene flow

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Which could cause a rare allele to increase in frequency?

• Natural selection

• A population bottleneck

• Founder effect

• All of these

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Which of these typically reduces variation in a population?

• Directional selection

• Mutation

• Gene flow

• Genetic drift

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_________ selection selects against both extremes in a population.

• Stabilizing

• Directional

• Disruptive

• Frequency-dependent

Which of these is true of a heterozygote advantage?

• It maintains variation in a population.

• Heterozygotes are selected against.

• Harmful alleles are always eliminated.

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Two small, recently isolated populations of the same species have very different allele frequencies. Why?

• Mutation

• Gene flow

• Genetic drift

• Sympatric speciation

When gene flow between two populations increases,

• speciation is more likely to occur

• they become genetically similar

• the fitness of both populations decreases

• the fitness of both populations increases

A new river forms and splits two populations, causing _________ speciation.

• sympatric

• allopatric

• parapatric

• convergent

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The genitalia of the male damselfly vary in shape. Males can only hold onto and mate with females whose genitalia fit.  What type of reproductive barrier is this?

• behavioral isolation
• temporal isolation 
• gametic isolation
• mechanical isolation 

Orcas occur in the same habitat but some are avoiding each other and do not interbreed. They have different diets, vocal behavior, and social structures. What type of speciation is this?

• allopatric

• sympatric

• parapatric

• convergent

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