"Mendel's Pea Hybrid Experiment (2)" Discovery of Genetic Factors PPT (Cross Experiment Process and Explanation of Two Pairs of Relative Characters in Lesson 1)

Description

"Mendel's Pea Hybrid Experiment (2)" Discovery of Genetic Factors PPT (Cross Experiment Process and Explanation of Two Pairs of Relative Characters in Lesson 1)

Part One: Curriculum Standard Requirements

1. Describe the experimental process of hybridization of two pairs of relative traits.

2. Clarify the explanation and related hypotheses for the phenomenon of free combination.

Literacy requirements

Scientific thinking: Cognitive scientists use research methods to discover new problems and master methods of using genetic diagrams to solve problems.

Mendel's pea hybridization experiment PPT, part 2: text analysis

1. Hybridization experiment of two pairs of relative traits

Basic review · Consolidate the foundation of teaching materials

1. Process and results

2. Recessiveness of traits

3. Separation ratio of relative traits

(1) Each pair of traits follows ____________________.

(2) Two pairs of traits ____________________, a total of 4 different traits, namely:

①Two parent types: yellow round grains and green wrinkled grains.

②Two new types (recombination types): ____________________, ____________________.

Judgment of right and wrong · Correction is easy to be confused and easy to make mistakes

(1) In Mendel’s hybridization experiment of two pairs of opposite traits, the recombinant traits appearing in F2 refer to yellow wrinkled grains and green round grains ()

(2) When homozygous yellow round peas and green wrinkled peas are crossed, the trait segregation ratio in F2 is close to 9:3:3:1 ()

(3) Genetic factors that control different traits are freely combined to form new recombinant traits ()

Deepen exploration and solve problems

Analyze Mendel's hybridization experiments for two pairs of relative traits. Answer the following questions:

1.What are the recombinant traits and parental traits of F2? What are their proportions in F2?

It is suggested that the recombinant traits are yellow wrinkled grains and green round grains. The proportions of the two recombinant traits in F2 are both 3/16, so the total proportion of the recombinant traits in F2 is 3/8; the parental traits are yellow round grains and green Wrinkled grains, the proportion of yellow round grains in F2 is 9/16, and the proportion of green wrinkled grains in F2 is 1/16, so the total proportion of parental traits in F2 is 5/8.

2. Change the parent (P) to: pure yellow wrinkled grain × pure green round grain. Explore the following questions:

(1)The trait of F1 at this time is _________.

(2)F2 trait segregation ratio:___________.

(3) Are the recombination types and proportions in F2 the same as those in the textbook?

2. Explanation of the phenomenon of free combination

Basic review · Consolidate the foundation of teaching materials

1. Theoretical explanation

(1) Two pairs of relative traits are controlled by ____________________.

(2) When F1 produces gametes, ____________________ are separated from each other and ____________________ can be freely combined.

(3) The female gametes and male gametes produced by F1 each have ________, and the number ratio between them is 1:1:1:1.

(4) During fertilization, the union of male and female gametes is _________.

2. Genetic Diagram

(1) Process diagram

(2) The types of genetic factors corresponding to various traits in F2:

①Double dominance: yellow round grains: _________, _________, _________, _________.

Judgment of right and wrong · Correction is easy to be confused and easy to make mistakes

(1) When F1 produces gametes, pairs of genetic factors can be combined freely ()

(2)F1 can produce four types of gametes: YR, Yr, yR, and yr ()

(3) During fertilization, there are 9 combinations of male and female gametes ()

(4) There are 4 types of genetic factors in F2, with a ratio of 9:3:3:1 ()

Mendel's pea hybridization experiment PPT, part 3: in-class drills and knowledge implementation

1. (2018·Shanxi Shuozhou Midterm) Which of the following statements about Mendel’s genetic experiments on two pairs of relative traits is incorrect?

A. Two pairs of relative traits are controlled by two pairs of genetic factors respectively.

B. The transmission of each pair of genetic factors follows the law of separation

The genetic factors controlling two pairs of traits in C.F1 fuse with each other

There are 16 combinations, 9 genetic factors and 4 trait expressions in D.F2

2. Mendel did not need to consider the following when conducting genetic experiments on two pairs of relative traits using peas.

A. Both parents must be homozygous

B. Each of the two pairs of relative traits must have a dominant and recessive relationship.

C. Detassel the female parent and inject pollen from the male parent

D. The dominant parent is the male parent, and the recessive parent is the female parent.

3. Mendel selected purebred yellow round peas and purebred green wrinkled peas to conduct two pairs of hybrid experiments with opposite traits. Which of the following statements is correct?

A.YyRr accounts for 2/16 of the total in F2

B. The yellow and green colors of peas refer to the color of the cotyledons rather than the color of the seed coat.

The trait combination peas in C.F2 that are not found in the parents account for 7/16 of the total number of peas.

D. Analyze each pair of relative traits separately, and F2 has a trait separation ratio of 1:2:1.

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For more information about the PPT courseware "Mendel's Pea Hybrid Experiment: The Discovery of Genetic Factors and the Interpretation of the Hybrid Experiment Process of Two Pairs of Relative Characters", please click on the PPT courseware "Mendel's Pea Hybrid Experiment: Discovery of Genetic Factors" PPT: The Interpretation of the Hybrid Experiment Process of Two Pairs of Relative Characters PPT labels.

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Update Time: 2024-09-29

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