"Transmission of genes between parents and offspring" PPT courseware on biological inheritance and variation

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"Transmission of genes between parents and offspring" PPT courseware on biological inheritance and variation

1. Genes and Chromosomes

What is the relationship between chromosomes, DNA, genes, and traits?

In human body cells, do genes exist in pairs or singly?

Because the chromosomes in somatic cells are paired, the genes are also ( ) and are located at the ( ) position of the paired chromosomes

genes and chromosomes

1. Genes are DNA segments on chromosomes that control biological traits.

2. In the body cells of organisms, chromosomes are in pairs, and genes are also in pairs, and they are located at the same position on the paired chromosomes.

3. A trait is controlled by a pair of genes

2. The rules of gene transmission between parents and offspring

1. The relationship between chromosomes, DNA and genes:

Genes are segments of DNA on chromosomes.

2. Changes in chromosome number during reproduction:

During reproduction, the number of chromosomes in germ cells is half that of somatic cells, but it is not an arbitrary half. Instead, one chromosome from each pair enters the sperm or egg cell.

On-site training

1. There are ____ DNA molecules on a chromosome and ____ pairs of genes.

2. There are ____ pairs of chromosomes in somatic cells and ____ chromosomes in reproductive cells.

3. Under normal circumstances, the number of chromosomes in human somatic cells, sperm and egg cells are ( )

A. 23 pairs, 23 bars, 23 bars B. 46 bars, 46 bars, 23 pairs

C. 46 pairs, 46 items, 23 items D. 23 items, 23 pairs, 23 items

(1) How many pairs of chromosomes are there in human body cells? How many DNA molecules does it contain? What is the origin of each pair of chromosomes?

(2) Does each gene in human body cells exist in pairs or individually? Approximately how many pairs of genes are there in human body cells?

Is a heritable trait controlled by a single gene, or by a pair of genes? Tell us its location on the chromosome?

Sort out and consolidate

Various traits of organisms are controlled by _____. The inheritance of traits is essentially the ____ passed from parents to offspring through the ____ process. In the process of sexual reproduction, ____ and _______ are the "bridges" that pass genes between parent and offspring. There are ___ chromosomes in somatic cells; ___ chromosomes in germ cells, with the number halved.

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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...

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

"Transmission of Genes Between Parents and Children" Biological Heredity and Variation PPT Courseware 3 1. Heredity and Variation (1) Heredity: Similarity between parents and children (2) Variation: Differences between parents and children and individual offspring 2. Biological traits (1) Types of traits: morphological and structural characteristics, physiological...

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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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