U6L2E4: Effects of Gene Flow

What is founder effect?

• Any change in the allelic frequencies in a population that is due to chance
• ›A small sample of a population settles in a location separated from the rest of the population
•   The process in which humans select for or against particular features in organisms
• ›Members of one sex choose mates with particular features

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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Which is a mechanism for change in allele frequency?

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

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A change in a gene pool due to chance.

• Genetic drift

• gene pool

• Founder effect

• Bottleneck effect

The effect that is produced when an insect carries pollen grains from one population to another is called

• gene flow

• random mating

• mutation

• mutation

Individuals with intermediate traits are more likely to survive and reproduce

• stabilizing selection

• directional selection

• disruptive selection

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the selection pressure favors the extreme phenotypes, dividing the population into 2 distinct groups

• directional selection

• stabilizing selection

• disruptive selection

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individuals with alleles for an extreme type are more likely to survive and reproduce

• stabilizing selection

• directional selection

• disruptive selection

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Scientists have discovered the specific mutation that famously turned moths black during the Industrial Revolution. In an iconic evolutionary case study, a black form of the peppered moth rapidly took over in industrial parts of the UK during the 1800s, as soot blackened the tree trunks and walls of its habitat.

• Stabilizing Selection

• Directional Selection

• Disruptive Selection

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