"Causes of Biological Evolution" Biological Evolution PPT Courseware 5

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"Causes of Biological Evolution" Biological Evolution PPT Courseware 5

1. In the process of biological evolution, why do some biological species become extinct?

2. How are new biological species formed?

3. What drives the continuous evolution of organisms in nature?

1. Analyze the causes of biological evolution

The birch moth is called the "spotted moth" in English. It is so called because the species collected before the mid-19th century all had light gray wings with spots scattered on them.

What do you think would be done if people were to restore the light-colored birch looper to a common form in Manchester, UK?

2. Long knowledge

Protective color: A body color similar to the color of the surrounding environment that an animal adapts to its habitat.

How is protective color formed?

3. Simulation exploration

Simulate the formation process of protective color

Ask the question: How are protective colors formed?

Make a hypothesis: Individuals whose body color is similar to the color of their habitat are more likely to survive.

Develop and implement a plan:

Grouping: 4 people in a group

Team leader: organize and issue orders

Inspector: Supervise and replenish the descendants of survivors (each survivor produces 3 descendants)

Predator: (You need to prey randomly, 5 times per generation, 1 per time. Prey: small pieces of paper)

Recorder: records the start number of each generation and the number of survivors

Discussion and communication:

1. Which color of paper has the most “survivors” in the first and fifth generations? What does this have to do with the color of the paper?

2. What are the changes between the first and fifth generations? What changes have occurred between the first and fifth generations?

3. Through the above simulation experiment, can you speculate on the formation process of protective color? Can you simply analyze the reasons for biological evolution from this?

get conclusion:

The formation of protective color is the result of the continuous evolution of organisms through genetic variation and natural selection in the process of fighting against the environment.

summary

Reasons for biological evolution:

Heredity and variation are the basis of biological evolution

Environmental changes are the external driving force for biological evolution

Living things can survive and thrive only by adapting to changing environments

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For more information about the PPT courseware "Evolution of Organisms and Reasons for Evolution of Organisms", please click the Evolution of Organisms ppt Reasons for Evolution of Organisms ppt tag.

"Causes of Biological Evolution" Biological Evolution PPT Courseware 6:

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"Causes of Biological Evolution" Biological Evolution PPT Courseware 3:

"Causes of Biological Evolution" Biological Evolution PPT Courseware 3 Collaborative preview, teacher-student interaction 1. In the Manchester area of ​​England in 1850, the body color of most birch inchworms (hu) was light-colored, and only a few were dark-colored; And 100 years later, in 1950, here...

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Update Time: 2024-11-30

This template belongs to biology courseware People's Education Edition Biology for Grade 8, Volume 2 industry PPT template

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