The Role of Mimicry and Selection in Butterfly Survival

The video tutorial explains how the environment exerts selective pressure on species, focusing on a butterfly population. It introduces Batesian mimicry, where edible butterflies mimic unpalatable species to avoid predation. The tutorial explores natural selection types: stabilizing, directional, and disruptive, using scenarios to illustrate how these processes affect butterfly populations over generations.

What role do predators play in the environment of the test species of butterflies?

• They help butterflies in pollination.

• They provide food for the butterflies.

• They exert selective pressure on the butterflies.

• They have no impact on the butterflies.

What is Batesian mimicry?

• When species mimic the sounds of predators.

• When unpalatable species mimic edible ones.

• When edible species mimic unpalatable ones.

• When species change color to blend with the environment.

How do birds learn to avoid certain butterflies?

• By tasting and remembering unpalatable species.

• By observing other birds.

• By listening to the sounds butterflies make.

• By following the scent of flowers.

What are the three types of natural selection discussed?

• Convergent, divergent, and parallel.

• Stabilizing, directional, and disruptive.

• Linear, exponential, and logistic.

• Random, selective, and adaptive.

In stabilizing selection, which phenotype is favored?

• All phenotypes equally.

• Extreme phenotypes.

• Intermediate phenotypes.

• Rare phenotypes.

What happens to the graph of the population in stabilizing selection?

• It has a higher, narrower peak.

• It shifts to the left.

• It becomes flat.

• It becomes wider and shorter.

What triggers directional selection in the butterfly population?

• Change in climate conditions.

• Introduction of a new food source.

• Disappearance of a distasteful species with few markings.

• Increase in the number of predators.

In directional selection, what happens to the population graph?

• It splits into two peaks.

• It shifts to the left.

• It remains unchanged.

• It shifts to the right.

What is the result of disruptive selection on the mimic population?

• The population size decreases significantly.

• The population is dominated by extreme phenotypes.

• The population is dominated by intermediate phenotypes.

• The population becomes more uniform.

What causes the decline in intermediately marked mimics during disruptive selection?

• Change in the environment's temperature.

• Introduction of a new butterfly species.

• Decrease in intermediately marked models.

• Increase in predator numbers.