Natural Selection

Fecundity refers to:

• An organisms phenotype

• A organisms genotype

• An organisms ability to reproduce

• An organisms ability to survive

Viability refers to:

• An organisms ability to reproduce

• An organisms ability to survive

• An organisms phenotype

• An organisms genotype

TRUE or FALSE: natural selection occurs when selection pressures shift towards fitter phenotypes.

• TRUE

• FALSE

Allele types and frequencies of a population at a point in time is known as the:

• Gene flow

• Population composition

• Gene pool

• Relative phenotype frequency

A chance or random event which impacts gene pool of a population is known as:

• Genetic drift

• Mutation

• Natural selection

• Gene flow

The process shown below is known as __________

The small seeded plants in an area were killed by a fungus. Finches with a small beak cannot crack open the large seeds from the plants that were left. What type of selection is likely to occur?

• directional selection

• stabilizing selection

• disruptive selection

• artificial selection

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Having a very high birth weight or a very low birth weight increases the mortality rate of human babies. What type of selection may occur over time?

• directional selection

• disruptive selection

• stabilizing selection

• artificial selection

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What type of natural selection is this?

• Disruptive Selection
• Directional Selection
• Stabilizing Selection
• Sexy Selection

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Scientists find that most feral cats in a neighborhood have whiskers about 12 cm long. After about 15 generations of stabilizing selection, what would you expect to see?

• even more cats with 12 cm long whiskers
• most cats with less than 12 cm long whiskers
• most cats with more than 12 cm long whiskers
• most cats with whiskers either less than or more than 12 cm long, very few with whiskers 12 cms 

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