"Causes of Biological Evolution" Biological Evolution PPT Courseware 2

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"Causes of Biological Evolution" Biological Evolution PPT Courseware 2

Darwin's view of biological evolution

What ideas in "The Origin of Species" shocked the world? What is the historical significance?

Biological species in nature are constantly evolving and developing from lower to higher levels. The rule of evolution in nature is natural selection and survival of the fittest; the theory of evolution deals a fatal blow to creationism. It proves that the entire organic world is the product of a long-term development and evolution process, and proposes the view that humans originated from ancient apes.

What is the central content of Darwin's theory of evolution?

The main contents of the theory of natural selection:

1. Overbreeding 2. Struggle for survival

3. Heredity and mutation 4. Survival of the fittest

struggle for survival

(1) Concept: The mutual struggle between biological individuals (of the same or different species), as well as the struggle between organisms and inorganic natural conditions (such as drought, cold), are natural phenomena that are relied upon to maintain individual survival and reproduce the race.

(2) Reasons: ① Over-reproduction of organisms ② There are certain limits to the living conditions (such as food and space) that organisms need to survive

(3) Result: A large number of biological individuals die, but a small number of biological individuals survive

3. Heredity and variation

(1) Some mutations are beneficial to the survival of organisms, while others are not. Mutations are non-directional. However, individuals with favorable mutations (that is, whose traits are adapted to the environment) are likely to win the struggle for survival and survive, leaving behind offspring.

(2) Advantageous mutations can be passed on to the next generation.

theory of natural selection

significance:

(1) Explain that species are changeable and evolve.

(2) Correctly explains the adaptability and diversity of organisms.

Shortcomings: Failed to elucidate the essence of inheritance and variation.

1. What are the differences between several breeds of chickens compared to jungle fowl?

Langshan chicken (for meat) is larger in size and has delicious meat.

Leghorn chickens have a high egg laying rate

Gamecocks are beautiful in shape, bright in color, and highly aggressive.

Silky chicken has high medicinal value

Reed chickens are larger in size and have a higher egg laying rate

1. How are these breeds of chickens produced?

People continue to select biological mutations based on different needs and hobbies, thus forming various new biological species.

2. Give examples of plant or animal varieties developed using artificial selection methods.

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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 5:

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"Causes of Biological Evolution" Biological Evolution PPT Courseware 4:

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Update Time: 2024-09-30

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

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