Bottleneck Genes: Black-Footed Ferrets 11-4-24

What is the primary diet of black-footed ferrets?

• Prairie dogs

• Squirrels

• Birds

• Fish

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Black-footed ferrets are a member of which family?

• Canine

• Feline

• Weasel

• Rodent

Which of the following is a threat to prairie dog colonies?

• Habitat destruction

• Overpopulation

• Abundant food supply

• Increased rainfall

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Fill in the blank: The remaining colonies of prairie dogs are relatively small and _______.

• Connected

• Fragmented

• United

• Dense

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Fill in the blank: A dominant gene always shows its effect even if a _______ gene is present.

• Recessive

• Dominant

• Neutral

• Active

Fill in the blank: The black-footed ferret population underwent a genetic _______ due to low numbers.

• Expansion

• Bottleneck

• Explosion

• Growth

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What does the genotype bb represent in genetic expression?

• Recessive gene expressed

• Dominant gene expressed

• No gene expressed

• Both dominant and recessive genes expressed.

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Nora is studying a population of butterflies and observes that 3 different colors are present out of 9 original colors. Calculate the percent (%) genetic diversity.

• 33.33%

• 50%

• 66.67%

• 75%

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During a field trip, Olivia and David observed a small isolated population of deer in a forest. What is the effect of a population bottleneck on the genetic diversity of this deer population?

• Increases genetic diversity

• Decreases genetic diversity

• Has no effect on genetic diversity

• Causes new mutations

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DOK Level 1: Recall

Which of the following is a result of cheetahs having gone through a population bottleneck?

• The cheetah species is more likely to become extinct.

• Mutations occur more frequently in the cheetah genome.

• Individual cheetahs have different alleles for many genes.

• The cheetah population cannot increase past a certain size.

Answer explanation

A population bottleneck reduces genetic variation. If variation is low, natural selection is less able to cause a change in allele frequencies in response to environmental change.

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