Name: _________________________________________ Period: _________ Date: ________________

1.11 Introduction to Evolution and Natural Selection

DIRECTIONS: Write down what the main difference between these two examples are.

Main Difference:

In example 1, ______________________. In example 2, ______________________.

Evolution is a change in a _____________________ over ___________.

■ Must involve changes through a __________________, NOT an individual.

■ Individuals may change during their lifetime, but that is _________ evolution.

■ Occurs when populations evolve as individuals with certain _____________ become __________ _____________________ than others.

■ Can occur on small or large scales and can occur _______________ or ____________________.

■ The __________________ _____________will spread through the population.

■ This change in the traits in a population is ______________________________.

1. How many brown beetles are there? How many green beetles?

2. Describe what you see happening to the beetles?

3. What color beetle would you like to be? Why?

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Do you think evolution is happening in:

A. Example 1

B. Example 2

C. Both

Name: _________________________________________ Period: _________ Date: ________________

1. How many brown beetles are there? How many green beetles?

2. What is happening to the population of beetles?

1. How many brown beetles are there? How many green beetles?

2. Describe what happened to the beetle population over time?

3. What beetle was best suited to survive?

■ Darwin’s 5 Points For Natural Selection:

1. Variation - A population needs to have _______________ (differences)

2. Variation to be favored - Some variations are more ___________________

3. Reproduction - More offspring are produced than _________________

4. Survival of the fittest - Those that survive, have favorable _______________

5. Population changes - Over time, populations _______________

Independent Practice

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Name: _________________________________________ Period: _________ Date: ________________

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Name: _________________________________________ Period: _________ Date: ________________

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Name: _________________________________________ Period: _________ Date: ________________

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