"Mutation of Organisms" Heredity and Variation of Organisms PPT Courseware 2

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"Mutation of Organisms" Heredity and Variation of Organisms PPT Courseware 2

Biological variation is common among living things.

Various relative traits are produced through mutation.

Question to be explored: Variation in peanut fruit size

Materials: Two varieties of peanuts, paper, pen, ruler

Method adopted: Draw conclusions by observing the characteristics of two different peanuts and measuring the data of two different peanut fruits.

hint:

1. Random sampling, the sample must be of sufficient quantity, no less than 30 pills

2. Measure the length of the long axis of the fruit in millimeters and round up.

3. Choose appropriate measurement tools and measurement methods

4. Use graph paper to draw a curve graph. The horizontal axis is the length of the fruit and the vertical axis is the number of samples. According to the intersection point of the two numbers, connect them into a curve (the measurement results can also be expressed as a histogram)

Analysis and research results:

a. There are smaller peanuts in big peanuts, and larger peanuts in small peanuts.

b. The average length of large peanuts > the average length of small peanuts

How to explain this phenomenon?

Differences in length of peanut fruits are mainly caused by differences in genetic material; variations in the length of the same peanut fruit are sometimes caused by the environment, and some are caused by changes in genetic material.

Analysis discussion questions:

(1) If the seeds of large peanuts are planted in poor soil, the fruits will be small, and if the seeds of small peanuts are planted in fertile soil, the fruits will be large. What causes this difference?

(2) If these two fruits are planted in the same soil, what will happen to the fruits they produce?

Practice one practice

1. A certain self-pollinating plant only blooms red flowers for several consecutive years and one white flower at a time. The descendants of the white-flowered plant all bloom white flowers. The reason for its variation is ( )

A. Gene separation B. Gene recombination C. Gene mutation D. Environmental influence

2. In animals that undergo sexual reproduction, there are always some differences between parents and offspring. The main reason for this difference is ( ).

A. Gene separation B. Gene recombination C. Gene mutation D. Environmental influence

3. Gene mutation ( ); genetic recombination ( ).

A. Produce new genes but not form new genotypes

B. Generate new genes and form new genotypes

C. No new genes are produced and new genotypes are formed.

D. No new genes are produced or new genotypes are formed.

4. The offspring of sexual reproduction have greater variability. The most fundamental reason is that

Increased frequency of A gene mutations

B There are many opportunities for structural variation of chromosomes

C There are many opportunities to generate new gene combinations

D is more susceptible to mutation due to environmental influences

5. Among the following high-tech achievements, which one was carried out based on the principle of genetic recombination?

① Chinese scientist Yuan Longping used hybrid technology to cultivate super rice

② Chinese scientists transplanted certain genes from Bacillus thuringiensis into cotton to create insect-resistant cotton

③ Chinese scientists cultivated space peppers by carrying seeds on returnable satellites

④ Chinese scientists have developed cloned cows through somatic cell cloning technology

A ① B ①② C ①②③ D ②③④

Use your brain

1. In agriculture, rays or drugs are used to treat crop seeds. The principle of obtaining new varieties is rays or drugs ( )

A. Directly changes some traits of crops

B． Changed the nutritional content of crop seeds

C. Eliminate some undesirable traits of crops

D. Change the genetic material in the seeds

2. Which of the following statements about the biological and practical significance of squadron mutations is incorrect ( )

A. Enable organisms to better adapt to changing environments

B. All mutations are beneficial to the survival of organisms

C. Mutation will produce new types of organisms, allowing organisms to continue to evolve.

D. People can use mutations that are beneficial to humans to breed new varieties

3. Among the following variations, the variation that cannot be inherited is ( )

A. The black, yellow and white of human skin B. The yellow, white and red of corn kernels

C.ABO blood type D.Wheat stalks growing in the shade are thin and the ears are small

Keywords: Biological inheritance and variation teaching courseware, biological variation teaching courseware, New People's Education Edition eighth grade biology PPT courseware for the second volume, eighth grade biology slide courseware download, biological inheritance and variation PPT courseware download, biological variation PPT Courseware download, .ppt format

For more information about the PPT courseware "Variation of Biology, Heredity and Variation of Biology", please click the "Variation of Biology ppt, Heredity and Variation of Biology" ppt tag.

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Update Time: 2024-10-02

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

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