"Dominant and Recessive Genes" Biological Inheritance and Variation PPT Courseware 2

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"Dominant and Recessive Genes" Biological Inheritance and Variation PPT Courseware 2

Why did Mendel choose peas as his experimental material?

1. Pea is a strictly self-pollinating plant and is closed-flowered.

2. The relative characteristics of peas are obvious.

1. Mendel’s pea hybridization experiments

Mendel's inference (1)

Relative traits are divided into dominant traits and recessive traits.

Being tall is a dominant trait and being short is a recessive trait. The hybrid offspring only performed high.

Mendel's inference (2)

Genes that control dominant traits are dominant genes, represented by capital letters (D), and genes that control recessive traits are recessive genes, represented by lowercase letters (d).

In the inheritance of relative traits, there is only one genetic composition that expresses recessive traits (dd); there are two genetic compositions that express dominant traits (DD or Dd).

Mendel's inference (3)

An individual whose genetic makeup is Dd only expresses traits controlled by D and not traits controlled by d, but d is not affected by D and will continue to be inherited.

Do you know how to do it?

1. The tall stem of peas is a dominant trait, represented by D. Then the genotype of short-stem peas is _____, and the genotype of tall-stem peas is _____ or _____.

2. If double eyelids are controlled by A and single eyelids are controlled by a, then the Aa individual behaves as _____.

3. A man rolls his tongue, his wife does not roll his tongue, and his son does not roll his tongue. Please write down their genetic types:

Man ( ) × Wife ( )

son( )

4. my country’s Marriage Law stipulates that marriage is prohibited between collateral blood relatives of __________ and __________.

summary:

1. Mendel’s pea hybridization experiment

1. Relative traits are divided into dominant traits and recessive traits.

2. In the inheritance of relative traits, the gene composition that expresses recessive traits has only one dd; the gene composition that expresses dominant traits has two DD or Dd.

3. An individual whose genetic composition is Dd will only express traits controlled by D and not those controlled by d, but d will continue to be inherited without being affected by D.

2. Prohibition of marriage between close relatives

The offspring of consanguineous marriages are more likely to suffer from genetic diseases.

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For more information about the PPT courseware "Inheritance of Biology and Dominant and Recessive Gene Variation", please click the Dominant and Recessive ppt tab of Biological Inheritance and Variation ppt Genes.

"Dominant and Recessive Genes" Biological Inheritance and Variation PPT Courseware 4:

"Dominant and Recessive Genes" Biological Inheritance and Variation PPT Courseware 4 Learning Objectives: 1. Give examples of the relationship between relative traits and genes, and describe the transmission characteristics of a pair of genes that control relative traits. 2. Explain the dangers of marriage between close relatives. 3. Enhance the ability to seek truth from facts..

"Dominant and Recessive Genes" Biological Inheritance and Variation PPT Courseware 3:

"Dominant and Recessive Genes" Biological Inheritance and Variation PPT Courseware 3 Pre-class Review 1. Genes: DNA segments on chromosomes that control biological traits 2. Genes are transmitted through sperm or egg cells, and sperm and egg cells are the genes in parent-child bridge of transmission. 3. ..

"Dominant and Recessive Genes" Biological Inheritance and Variation PPT Courseware:

"Dominant and Recessive Genes" Biological Inheritance and Variation PPT Courseware Review and Thoughts 1. How are genes passed on to offspring? Reproductive methods 2. What are biological traits? Give examples. Biological morphology, structure characteristics, physiology Characteristics, behavior, etc..

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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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