Selection Types in Evolutionary Biology

Selection Types in Evolutionary Biology

Assessment

Interactive Video

Biology, Science, Other

9th - 12th Grade

Hard

Created by

Patricia Brown

FREE Resource

The video tutorial explores natural selection through examples of ground finches, ducks, and lizards. It discusses how environmental changes affect the distribution of traits within populations, leading to directional, disruptive, and stabilizing selection. Ground finches in the Galapagos show variation in bill size, with deeper bills favored during droughts. Ducks experience disruptive selection, where extreme bill lengths are advantageous. Lizards undergo stabilizing selection, favoring average body sizes. The tutorial explains how these selection modes influence population traits over time.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What was the main factor that determined the survival of ground finches during the drought?

The color of their feathers

The size of their wings

The depth of their bills

The length of their legs

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

During the drought, which type of bill was less likely to survive?

Medium-sized bills

Narrow bills

Deep bills

Short bills

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What environmental condition led to the change in bill size distribution among ground finches?

New food sources

Increased predators

Drought

Flooding

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In directional selection, what happens to the mean trait value of a population over time?

It becomes more variable

It splits into two extremes

It remains the same

It shifts in one direction

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a key feature of directional selection?

The population splits into two groups

The population becomes more diverse

The mean trait value shifts over time

The mean trait value remains constant

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which type of selection favors individuals with traits at both extremes?

Artificial selection

Disruptive selection

Directional selection

Stabilizing selection

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In disruptive selection, what happens to the mean trait value?

It becomes more variable

It remains unchanged

It decreases

It increases

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