"Genes Control Biological Traits" Biological Inheritance and Variation PPT Courseware 7

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"Genes Control Biological Traits" Biological Inheritance and Variation PPT Courseware 7

test you

What is the relationship between the individual animals in this set of pictures you see?

Are each of their children similar to their parents?

Is it exactly the same?

Why are they both similar and different from their parents?

summary

What is heredity?

Heredity refers to the similarity between parents and children

What is mutation?

refers to the differences between parents and children and between individual offspring

Observe and think

Self-study guide one

1. The characteristics of living things refer to the characteristics of living things in _______, _______, _______, etc.

2. Give examples of the characteristics of various organisms? See who talks the most.

3. What are the relative characteristics of organisms? Looking at the characteristics of the students in our class, what relative traits can you tell?

Observe yourself or your classmates:

Are there earlobes?

Is it a single eyelid or a double eyelid?

Dimples or no dimples?

Can you curl your tongue from both sides to the center?

Can you bend your thumb dorsally?

think

1. Can you know all your characteristics just by naked eye observation or simple measurement?

2. Try to summarize what are the characteristics of living things?

3. Through observation and combined with your own life experience, give examples of the different manifestations of the same traits of the same species.

4. Choose any of the above human characteristics and see if you are the same as your father or mother. If not, then see if you and your parents have the same parents. This shows what?

5. Are all traits of organisms heritable?

Exercise 1

(1). For the same mature fish, the carp is larger and the crucian carp is smaller. This is a relative trait.

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

(3). The surface of plum fruit is smooth, while the surface of peach fruit is either smooth or hairy. They can be called relative traits to each other.

Mother: double eyelids, earlobes, and thumbs that can be bent dorsally;

Father: Single eyelids, earlobes, and thumbs that cannot be bent dorsally;

Xiaohong: Double eyelids, no earlobes, and thumbs that cannot be bent dorsally.

Please analyze based on the above information:

(1) The mother has double eyelids, and Xiaohong also has double eyelids, which illustrates the biological _____ phenomenon.

(2) Both parents have earlobes, but Xiaohong has no earlobes, which illustrates the biological _____ phenomenon.

(3) There are _____ pairs of relative traits, which are __________

Single eyelids vs. double eyelids, with or without earlobes, whether the thumb can bend dorsally or not

Discuss

(1) What traits are being studied in this study?

Rat body size

(2) What is the gene that controls this trait?

rat growth hormone gene

(3) What does the acquisition of transgenic super mice indicate about the relationship between traits and genes? Genes control biological traits

(4) Inferring from this, what do you think living things pass on during the process of passing on their families?

What is passed on is the gene that controls the trait

Consolidation exercises:

1. "If you sow melons, you will get melons; if you sow beans, you will get beans." "One mother gives birth to nine sons, and even the mother has ten sons." This shows that ( ) is common in nature.

A Reproductive and developmental phenomena B Evolutionary phenomena

C Heredity and mutation phenomena D Supernatural phenomena

2. Characteristics refer to ( )

A The shape of the organism B The sex of the organism

C Morphological characteristics, physiological characteristics and behavioral patterns of organisms, etc.

D size of organism

3. Which of the following traits cannot be inherited ( )

A A sighted couple gives birth to a color-blind son

B The fur colors of rabbits include white, black, etc.

C Individual albino seedlings often appear in corn fields

D People who often work in the field have darkened skin

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For more information about the PPT courseware "Heredity and Variation of Organisms, Genes Control the Characteristics of Organisms", please click the Inheritance and Variation of Organisms ppt, Genes Control the Characteristics of Organisms ppt tag.

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Update Time: 2024-08-31

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

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