"Human Traits and Heredity" PPT courseware

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"Human Traits and Heredity" PPT courseware

Part One: Objectives of this Section

1. List common genetic traits in the human body

2. Give examples of the relative characteristics of people

3. Give an example of biological traits that are controlled by genes.

Work in groups to explore and complete the following content

1. What are genetic traits? What are the common genetic traits in the human body?

2. Give an example of what relative traits are?

3. In somatic cells, do genes that control traits exist alone or in pairs?

4. What is a dominant gene? What is a recessive gene?

5. If we use A to represent dominant genes and a to represent recessive genes, what are the gene combinations for dominant traits? What are the genetic combinations for recessive traits?

6. If someone’s gene combination for a certain trait is Dd, how many types of germ cells will he produce? What is it?

Part 2: Common genetic traits in the human body

Characteristics that can be inherited by organisms are called genetic traits

Relative traits

Are the following relative traits? Why?

1. For the same mature fish, carp is larger and crucian carp is smaller.

2. Goldfish have transparent and opaque body colors, which are relative traits.

3. A dog’s straight hair and a dog’s white hair are relative traits.

1. In somatic cells, do genes that control traits exist alone or in pairs?

Usually exist in pairs

2. What is a dominant gene? What is a recessive gene?

Genes that control dominant traits are called dominant genes

Genes that control recessive traits are called recessive genes

For example:

Having earlobes - dominant trait - controlled by dominant gene A

No earlobes—recessive trait—controlled by recessive gene a

3. If we use A to represent dominant genes and a to represent recessive genes, what are the gene combinations for dominant traits? What are the genetic combinations for recessive traits?

Gene combination for dominant trait: AA Aa

Gene combination for recessive traits: aa

The third part of the content: PK with the same number

1. What are genetic traits? ( )

A. Morphological characteristics of organisms

B. Physiological characteristics of organisms

C. Morphological characteristics and physiological characteristics of organisms

D. Characteristics that an organism can inherit

2. The curly and black color of human hair is ( )

A. A pair of relative traits

B. Dominant traits

C. Recessive traits

D. Genetic traits

3. When parents of genotype AA and aa are crossed, what is the genetic composition of the fertilized egg? ( )

A.Aa B.AA

C, aa D, all three are OK

Keywords: Jiangsu Education Edition eighth grade biology PPT courseware for the second volume free download, human traits and heredity PPT download, .PPT format;

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"Human Traits and Heredity" PPT:

"Human Traits and Heredity" PPT Part 1 content: Observe and think about the following traits, which of your traits are the same as your father? Which ones are the same as your mother? 1. Are there earlobes in the ears? 2. Can you separate the tongue from the tongue? Curl both sides toward the center 3. Can you make your thumbs...

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Update Time: 2024-11-23

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

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