"Heredity and Environment" PPT courseware

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"Heredity and Environment" PPT courseware

Part One: Knowledge Review:

1. What is genotype?

Refers to the genetic makeup of an individual organism.

2. What is phenotype?

Refers to a specific characteristic of an individual organism.

Why do different races have different skin color phenotypes?

Because different races have different genotypes.

Does sunlight cause genotypic changes, or just phenotypic changes?

Heredity and Environment PPT, Part 2: Problem Discussion:

Please tell us what environmental factors may have caused the changes in plant seedling traits in this experimental study?

What is the basis for your judgment?

think:

Can you give examples in daily life where environmental conditions affect biological phenotypes?

Do environmental conditions change an organism's phenotype or genotype?

The genotype is often relatively stable and determines the phenotype, which is easily affected by the environment.

In short, phenotype is the result of the interaction between genotype and environmental conditions.

What are the two types of variation?

Variation types are divided into heritable variation and non-heritable variation.

Any variation in a trait that can reappear in future generations is called heritable variation. For example, high-yield lodging-resistant wheat and low-yield lodging-resistant wheat are hybridized to produce high-yield lodging-resistant wheat.

Variations that do not involve changes in genetic material and are caused solely by environmental conditions are called non-heritable variations. For example, corn grows differently in different environments.

Heredity and Environment PPT, Part 3: Classroom Exercises

1. The cause of heritable variation is ( )

A． environmental change

B. temperature change

C． changes in genetic material

D. climate change

2. Wheat of the same variety in the same field grows in shaded areas with thinner stems and smaller ears than in sunny areas. The main reason for this phenomenon is ( )

A． Not enough moisture

B. Not enough sunlight

C． changes in genetic material

D. Not enough fertilizer

3. A wheat field belonging to farmer Lao Wang’s family had a gratifying harvest due to sufficient rain last year, with large and plump grains. So this year, Lao Wang used this as a good seed to sow. This year’s harvest is ( )

A. The grains must be big and plump.

B. Not necessarily big and plump.

C. The grains will definitely not be big and plump.

D. Same as last year

Keywords: Beijing Normal University version of the eighth grade biology PPT courseware for the first volume free download, genetics and environment PPT download, .PPT format;

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

"Heredity and Environment" PPT:

"Heredity and Environment" PPT Part One Content: Learning Objectives 1. Give examples to illustrate the relationship between genotype, phenotype and environment, and distinguish heritable variation from non-heritable variation. 2. Cultivate the ability to analyze problems, experimental design capabilities, data analysis capabilities, and cultivate cooperative...

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Update Time: 2024-11-01

This template belongs to biology courseware Beijing Normal University Edition Eighth Grade Biology Volume 1 industry PPT template

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