"Genes Control Biological Traits" Biological Inheritance and Variation PPT Courseware 2

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"Genes Control Biological Traits" Biological Inheritance and Variation PPT Courseware 2

【Autonomous learning】(P24~26)

1. Heredity and variation: Heredity refers to the similarity between parents and children. Variation refers to the differences between parents and offspring. Biological inheritance and variation are achieved through reproduction and development. People's understanding of the inheritance and variation of living things initially began with shape. Later we will delve into the genetic level.

2. The shape of living things; any living thing has many traits, some of which are structural characteristics, some of which are physiological characteristics, and some of which are behavioral patterns, etc.

3. The relative characteristics of organisms refer to different expressions of the same shape of the same organism.

2. Show doubts

1. What is a trait? What are relative traits?

2. What is the relationship between traits and genes?

[Think about it and discuss it] (P24)

The picture below shows a cow cloned from the somatic cells of an adult cow. They are almost identical. Why do they look so similar?

Heredity refers to the similarities between parents and children;

Variation refers to the differences between parents and offspring.

People's understanding of heredity and variation initially started with traits, and later, with the development of science and technology, it reached the genetic level.

【Discussion】(P26)

① Try to summarize what are the characteristics of living things?

Traits are a collective term for the morphological structure, physiological and behavioral characteristics of organisms.

② Give examples of the different manifestations of the same trait in the same species of organisms.

Such as human earlobes: without earlobes and with earlobes;

Eyelids: single eyelids and double eyelids;

Tongue: Rolling tongue and inability to roll tongue;

Thumb: can and cannot be bent

③Can you know all of your traits just by visual observation or simple measurements?

cannot. The naked eye can only observe certain morphological structural characteristics and behavioral patterns, but cannot observe the physiological characteristics of organisms, etc.

④Which traits are the same as those of your parents? What does this mean?

Ear lobes, thumbs curved dorsally, right-handed. Heritable.

【Standard Compliance Test】

1. Which of the following phenomena is not genetic ( )

A. If you sow melons, you will reap melons; if you sow beans, you will reap beans.

B. A pig gives birth to nine piglets, and even the mother has ten offspring.

C. Dragon begets dragon, phoenix begets phoenix, mice are born to make holes.

D. Sheep give birth to sheep, and cows give birth to cows.

2. Which of the following is not a human trait ( )

A. Skin color B. Blood type

C.Albinism D.Tooth decay

3. Among the following groups of traits of people, the one that is not a relative trait is ()

A. Double eyelids and single eyelids

B. Blondes and curly hair

C. With and without earlobes

D. White skin and dark skin

discuss

1. In this study, which trait of mice was studied? What is the gene that controls this trait?

Rat size Rat growth hormone gene

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

Genes control biological traits.

3. In the process of biological propagation, are traits or genes that control traits passed on?

4. Are all traits of organisms heritable? try to explain

Compliance testing

1. What controls biological traits)

A. Nucleus B. Gene C. Cytoplasm D. Cell membrane

2. Transferring a certain gene of an organism into the genome of another organism using biotechnological methods, and cultivating an organism that exhibits the traits controlled by the transferred gene is called ( )

A. Genetically modified organisms B. Genetically modified organisms

C. Give genetic organisms D. Introduce genetic organisms

3. One of the functions of genes is to transmit genetic information. The following are not directly related to this function ( )

A.DNA replication B.Reproduction

C. Cell division D. Protein synthesis

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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: 2024-11-22

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

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