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

Description

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

learning target

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 questions

Heredity: Similarity between parent and child.

Variation: Differences between parents and offspring and between individual offspring.

Traits: A general term for the morphological structure, physiology and behavior of living things. Characters are determined by ___. What are inherited from organisms are ___.

Characteristics of chromosomes

1. The number and shape of chromosomes in different organisms are certain.

2. In the somatic cells of organisms, chromosomes exist in pairs in the nucleus.

3. In reproductive cells (sperm and egg cells), chromosomes exist individually, and their number is half that of somatic cells.

4. A chromosome composed of DNA and protein contains one DNA molecule (number of chromosomes = number of DNA molecules

Characteristics of genes

1 Genes control biological traits

2 Definition: A gene is a DNA segment with genetic effects.

3 genes exist in pairs, each located at the same position on the paired chromosomes

How are genes passed on to future generations?

It is passed on to offspring through sperm or egg cells.

During the cell division process that forms sperm or egg cells, the chromosomes are reduced by half, and not just any half. One chromosome from each pair enters the sperm or egg cell.

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For more information about the PPT courseware "Inheritance of Biology and Transmission of Mutated Genes between Parent-Child Generations", please click on the PPT tab of "Heredity of Biology and Transmission of Mutated Genes between Parent-Child Generations".

"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 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...

"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: 2024-10-05

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

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