"Changes in Population Genetic Composition and Formation of Species" Biological Evolution PPT Courseware (Lesson 2: The Role of Isolation in Speciation)

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"Changes in Population Genetic Composition and Formation of Species" Biological Evolution PPT Courseware (Lesson 2: The Role of Isolation in Speciation)

Part One: Course Standard Requirements

Explain that variation, selection, and isolation can lead to the formation of new species.

Core competency docking

1. Concept of life - understand the definition and types of isolation, and clarify the role of isolation in speciation.

2. Scientific thinking - use inductive and comprehensive thinking methods to outline conceptual models of the two processes of speciation.

Changes in population genetic composition and formation of species PPT, Part 2: Species and isolation

Autonomous sorting

1. The concept of species is a group of living things that can _______________ and produce _______________ in a natural state.

2.Isolation

[Typical Example 1] (2019·Shizuishan Third Intermediate Period) The following statements about species and isolation are incorrect ()

A. Species are the basic unit of biological classification

B. Diploid watermelon and tetraploid watermelon belong to the same species

C. There must be reproductive isolation between different species

D. Although horses and donkeys can produce mules, they belong to different species.

Analysis: There is reproductive isolation between diploid watermelon and tetraploid watermelon, and they belong to different species. B is wrong.

Answer B

[Practice 1] Which of the following statements about species and isolation is incorrect ()

A. Differences in population gene pools are the fundamental cause of reproductive isolation

B. Isolation prevents genetic exchange between populations

C. There must be reproductive isolation between different species

D. For all species, geographical isolation inevitably leads to reproductive isolation

Analysis: Geographic isolation is a process of quantitative change. Reproductive isolation can only occur after a long enough time. Error D.

Answer D

Changes in population genetic composition and speciation PPT, Part 3: The role of isolation in speciation

Autonomous sorting

1. The process of formation of new species

2. Conclusion: Isolation is the _______________ condition for speciation.

think

(1) Is tetraploid watermelon an independent new species? Why?

Tip Yes. Because tetraploid watermelons can mate freely and produce fertile offspring.

(2) During the formation process of tetraploid watermelon, was there any geographical isolation?

Tip: No.

(3) Is triploid watermelon a new independent species? Why?

Tip: No. Because triploids have disordered synapsis during meiosis and cannot produce normal sexual germ cells, they cannot mate freely and produce fertile offspring.

[Typical Example 2] (2019·Bengbu Second Intermediate Period) Squirrels in a certain grand canyon were separated into two populations by a river. Ten thousand years later, the two populations have clearly differentiated. After long-term evolution, two populations may form two species. Which of the following statements is incorrect ()

A. The formation of species must pass through a before finally reaching c

B.b represents the process of natural selection

C.①②③④⑤⑥Provide raw materials for biological evolution

D.c represents reproductive isolation

[Practice 2] (2019 Chifeng Second High School Monthly Examination) The cultivation process of seedless watermelon is shown in the figure. According to the diagram and combined with the biological knowledge you have learned, which of the following statements is correct ()

A. The ① process can only be treated with colchicine. Its main function is to inhibit the formation of spindles in the early stages of cell mitosis.

B. The triploid seed develops into a seedless watermelon, which is closely related to the centrosome.

C. There is no reproductive isolation between tetraploid watermelon and diploid watermelon. They belong to the same species.

D. The childless trait is a heritable variation, but it cannot be passed on to offspring through sexual reproduction.

Keywords: Free download of the PPT courseware for high school biology compulsory course 2 of the People's Education Press, PPT download of changes in population genetic composition and formation of species, PPT download of the evolution of organisms, PPT download of the role of isolation in speciation, .PPT format;

For more information about the PPT courseware "Evolution of Organisms: Changes in Genetic Composition of Populations and Speciation and the Role of Isolation in Speciation", please click "Evolution of Organisms" PPT "Changes in Genetic Composition of Populations and Speciation" PPT "The Role of Isolation in Speciation" PPT labels.

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Update Time: 2024-11-21

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