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

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

Review & Thoughts

1. How are genes passed on to future generations?

Reproductive mode

2. What are biological traits? Give examples.

The performance of living things in terms of morphological structural characteristics, physiological characteristics, behavioral patterns, etc. Such as a person’s height, blood type; the taste of fruits, etc.

3. What are relative traits? for example.

Different manifestations of the same trait in the same organism

4. If the father’s sperm is A and the mother’s egg cell is A, what is the genetic composition of the fertilized egg? Aa

Read the first natural paragraph on pages P32 to 33 and answer the following questions

1. What problem did Mendel want to study?

Inheritance of relative traits

2. How did Mendel implement his plan?

Cross purebred tall-stemmed peas and dwarf-stemmed peas to observe the characteristics of the first and second generations of the hybrids.

3. After the experiment, what did he discover?

The first generation of hybrids all showed tall stems, while the second generation of hybrids showed both tall and short stems, but there were more individuals with tall stems than individuals with short stems.

get conclusion:

1. Genes are divided into ________ and ________.

(Usually represented by the same English letter, uppercase indicates dominant genes, lowercase indicates recessive genes. Such as A\a, B\b, D\d)

2. Relative traits are divided into ________ and ________.

3. Gene composition DD, Dd behaves as ________; dd behaves as ________.

4. If the genome becomes Dd, the controlled traits will not be expressed, but ____ (recessive gene) is not affected by ____ (dominant gene) and will continue to ________.

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 the double eyelid is controlled by A and the single eyelid is controlled by a, then the individual Aa will behave 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 ______.

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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 2:

"Dominant and Recessive Genes" Biological Inheritance and Variation PPT Courseware 2 Why did Mendel choose peas as experimental materials? 1. Pea is a strictly self-pollinating plant, and it is closed-flowered. 2. The relative characteristics of pea are obvious. 1. Mendel’s pea hybridization experiment Mendel...

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Update Time: 2024-09-05

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

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