"DNA is the main genetic material" PPT

Description

"DNA is the main genetic material" PPT

Part One: Learning Objectives

1. Explain that DNA is the main genetic material.

2. Describe the relationship between chromosomes, DNA, and genes.

discuss

Why do white rats give birth to gray rats?

What did you discover in this experiment?

The mouse has the same “color” as the mother mouse that provided the “nucleus”

Thoughts and Discussions

Some people say that the little squirrel has three "mothers". Which mother is more similar to it? Why?

Squirrel.

Gray mice receive genetic material from the nuclei of gray mouse cells.

The phenomenon of similarity between biological parents and offspring is called heredity. It is a ubiquitous phenomenon in the biological world.

DNA is the main genetic material PPT, Part 2: Genetic material in the nucleus

The chromosomes in the cell nucleus play an important role in the propagation of organisms.

1. The number of chromosomes in each organism is generally certain and they appear in pairs.

2. Changes in chromosome number or structure will affect the normal growth and development of organisms.

3. Chromosomes are mainly composed of DNA and proteins

4. Schematic diagram of DNA molecular structure

DNA molecular structure

From a structural point of view, the DNA molecule is composed of two long chains, which are like spiral stairs, coiled around each other, forming a regular double helix structure.

5. Explain the relationship between genes, nucleus, DNA and chromosomes

⑴The relationship between chromosomes and genes: There are many genes on a chromosome, and the genes are arranged linearly on the chromosome.

⑵The relationship between chromosomes and DNA: There is only one DNA molecule on each chromosome, and chromosomes are the main carriers of DNA molecules.

⑶The relationship between DNA and genes: There are many genes on each DNA, and genes are DNA fragments with genetic effects.

DNA is the main genetic material PPT, part 3 content: Class summary

1. The nucleus is the center of genetic information

1. Mouse nuclear transplantation experiment.

2. Explain that the center of genetic information is the nucleus.

2. Genetic material in the nucleus

1. The number of chromosomes in each organism is generally certain and appear in pairs.

2. Chromosomes are mainly composed of DNA and proteins.

3. There is only one DNA molecule on each chromosome, and there are many genes on each DNA. Genes are DNA fragments with genetic effects.

DNA is the main genetic material PPT, part 4: training to meet standards

1. The main genetic material refers to ( )

A. Chromosome B. DNA

C. protein d. RNA

2. Normal human body cells contain chromosomes ( )

A. Article 23 B. 12 pairs

C. 23 pairs D. 39 pairs

3. Which of the following is not a genetic phenomenon ( )

A. "My parents have double eyelids, my son has single eyelids"

B. "If you sow melons, you will reap melons; if you sow beans, you will reap beans."

C. "The enemy will come out of the gate"

D. "Rat can dig holes when giving birth"

Keywords: Jiangsu Education Edition eighth grade biology PPT courseware for volume 2 free download, DNA is the main genetic material PPT download, .PPT format;

For more information about "DNA is the main genetic material" PPT courseware, please click on the DNA is the main genetic material ppt tag.

File Info

Update Time: 2024-10-20

This template belongs to biology courseware Jiangsu Education Edition 8th Grade Biology Volume 2 industry PPT template

Preview