"Genes Control Biological Traits" Biological Inheritance and Variation PPT Courseware 4

Description

"Genes Control Biological Traits" Biological Inheritance and Variation PPT Courseware 4

learning target:

1. Give examples of biological traits and the continuation of traits between parent and offspring. Give examples of the differences between different traits and relative traits.

2. Give an example of biological traits that are controlled by genes.

3. Pay attention to the impact of genetically modified technology on human beings.

Concepts of inheritance and variation:

Heredity: Refers to the similarities between parents and children.

Variation: refers to the differences between parents and offspring.

What is a trait?

In genetics, the morphological structure, physiological characteristics and behavioral patterns of organisms are collectively referred to as traits.

What are relative traits?

Different manifestations of the same trait in the same organism.

Activity 2: Discuss in groups and see which group members answer quickly and accurately.

1. What characteristics do biological traits include? Can all traits be observed with the naked eye?

2. Give examples of the different manifestations of the same trait in the same species of organisms; each trait has only two manifestations?

3. Are all traits heritable? for example.

4． What is a relative trait? Give an example.

Activity 3: Discuss textbook p30 exchange:

1. In this study, what traits are being studied? What gene controls this trait?

---The trait studied is the individual size of the rat. Rat growth hormone gene.

2. What does the acquisition of transgenic super mice indicate about the relationship between traits and genes?

----Explain that genes control the traits of organisms.

3. It can be deduced from this that in the process of biological transmission, are traits or genes that control traits passed on?

----What is passed on is the gene that controls the trait.

GM technology

Genetically modified organisms are created by transferring a certain gene from one organism into the genome of another organism using biotechnological methods. Such as: genetically modified animals, genetically modified food, genetically modified drugs

practise

1. Heredity refers to the ____ between parents and children, variation refers to the ____ between parents and offspring individuals, and biological inheritance and variation are achieved through ________.

2. What controls biological traits ( )

A. Nucleus B. Chromosome C. Gene D. DNA

3. What is passed on in the process of biological propagation ( )

A. Trait B. Gene C. Nucleus D. Germ cell

Xiao Ming's mother has double eyelids, has earlobes, and her thumbs are bent dorsally; her father has single eyelids, has earlobes, and his thumbs cannot bend dorsally; Xiaoming has double eyelids, no earlobes, and his thumbs cannot bend dorsally. Please analyze based on the above information:

The mother has double eyelids, and Xiao Ming also has double eyelids, which illustrates the biological phenomenon of ( ).

Both parents have earlobes, but Xiao Ming has no earlobes, which illustrates the biological phenomenon of ( ).

The above materials have ( ) pairs of relative properties, which are ( ), ( ), and ( ) respectively.

summary:

1. Heredity and variation

2. The concepts of traits and relative traits

3. Enlightenment of genetically modified super mice

4. Transgenic technology

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For more information about the PPT courseware "Heredity and Variation of Organisms, Genes Control the Characteristics of Organisms", please click the Inheritance and Variation of Organisms ppt, Genes Control the Characteristics of Organisms ppt tag.

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Update Time: 2024-07-29

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

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