"Transmission of genes between parents and offspring" Biological inheritance and variation PPT courseware 3

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"Transmission of genes between parents and offspring" Biological inheritance and variation PPT courseware 3

1. Heredity and variation

(1) Heredity: Similarity between parents and children

(2) Variation: Differences between parents and offspring and between individual offspring

2. Characteristics of living things

(1) Types of traits: morphological structural characteristics, physiological characteristics, behavioral patterns, etc.

(2) Relative traits: different expressions of the same trait in the same species of organism

For example: the red and yellow of tomato fruits; the white and black of rabbit fur; human double eyelids and single eyelids, etc.

3. Gene controlled traits

(1) Transgenic super mouse:

The acquisition of transgenic super mice illustrates the ability of genes to control biological traits.

(2) Genetically modified organisms: organisms created by transferring a gene from one organism into the genome of another organism using biotechnological methods.

1. Genes and chromosomes

Genes are regularly concentrated on the chromosomes in the cell nucleus, and the shape and number of chromosomes in each biological cell are certain.

Observation and thinking 1

Carefully observe the collated chromosome diagram in human (female) cells (as shown on the right) and answer the following questions:

How many chromosomes are there in human cells? Why are these chromosomes drawn in pairs?

46 items. Because in biological body cells, chromosomes exist in pairs.

Discussion 3

If a long rope is used to represent the DNA molecule, and red, orange, yellow, green, blue and other colors are painted on different segments on the long rope, what do the different colored segments represent?

How can we make long ropes look like short rod-shaped chromosomes?

Segments of different colors represent genes that control different traits. By continuously shortening and thickening the spiral of the long rope, the long rope can be processed into a short rod-shaped chromosome.

Class summary

genes and chromosomes

Chromosomes in the cell nucleus exist in pairs.

Genes also exist in pairs.

Genes are DNA segments on chromosomes that control biological traits.

Genes are passed on through germ cells.

Standard training

1. How are parents’ traits passed on to their children ( )

A. Through the words and deeds of parents

B. Through children’s learning and imitation

C. Through long-term living together

D. Through germ cells

2. The fertilized egg of a swan develops into a swan instead of an ugly duckling because the fertilized egg contains a unique ( )

A.Character B.Cell

C. Genetic material D. Cell membrane

3. Which of the following statements about genes is correct ( )

A. There are no genes in animal and plant cells

B. Only fertilized eggs contain genes

C. There are genes only in the somatic cells of organisms

D. The fertilized egg contains genes from both parents.

4. It is known that the number of chromosomes in rice somatic cells is 24. What are the number of chromosomes in the sperm and egg cells produced by it ( )

A.Article 24, Article 24 B.Article 24, Article 12

C.Article 12, Article 12 D.Article 12, Article 24

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For more information about the PPT courseware "Inheritance of Biology and the Transmission of Variation Genes between Parent-Child Generations", please click the "Heredity of Biology and Transmission of Variation Genes Between Parent-Child Generations" ppt tag.

"Transmission of genes between parents and offspring" Biological inheritance and variation PPT courseware 5:

"Transmission of genes between parents and offspring" Biological inheritance and variation PPT courseware 5 How are genes that control traits passed on to offspring? Heredity: refers to the similarities in form, structure and function between parents and children. Variation: refers to the differences between parents and offspring and between individual offspring.

"Transmission of genes between parents and offspring" Biological inheritance and variation PPT courseware 4:

"Gene Transmission between Parents and Children" Biological Inheritance and Variation PPT Courseware 4 Learning Objectives 1. Describe the relationship between chromosomes, DNA and genes. 2. Describe the changes in chromosomes during reproduction. 3. Explain the transmission of genes between parent and offspring through germ cells. Review tips...

"Gene Transmission between Parents and Children" Biological Inheritance and Variation PPT Courseware 2:

"Gene Transmission between Parents and Children" Biological Inheritance and Variation PPT Courseware 2 We know that most life begins with a fertilized egg. In the process of sexual reproduction, sperm and egg cells are the bridge for the transmission of genes between parents and children. Observation and thinking 1 Human body fine...

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Update Time: 2024-11-19

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

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