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6. The famous geneticist, T.H. Morgan, carried out a series of experiments on linkage mapping in Drosophila. He constructed a series of three-point testcrosses for his mapping studies. What is a three-point testcross (Diagram the genotypes of the parents involved in such a cross)? How many F1 progeny classes are possible from such a cross (show your calculation for your answer)? 1_11_2021 In one such cross, Morgan examined the linkage of three genes v (vermillion eye), cv (crossveinless wings), and ct (cut wing margin). These three are the mutant phenotypes, the wildtype being red eye, crossvein and normal wing margin. From a three-point testcross he obtained the following progeny: + + + AA + > > V + V CV CV +Q CV ct U+ ++++ + ct ct - 580 - 45 - 5 94 CV ct What is the genetic map of these three loci? - 592 40 3 89 3

6. The famous geneticist, T.H. Morgan, carried out a series of experiments on linkage mapping in Drosophila. He constructed a series of three-point testcrosses for his mapping studies. What is a three-point testcross (Diagram the genotypes of the parents involved in such a cross)? How many F1 progeny classes are possible from such a cross (show your calculation for your answer)? 1_11_2021 In one such cross, Morgan examined the linkage of three genes v (vermillion eye), cv (crossveinless wings), and ct (cut wing margin). These three are the mutant phenotypes, the wildtype being red eye, crossvein and normal wing margin. From a three-point testcross he obtained the following progeny: + + + AA + > > V + V CV CV +Q CV ct U+ ++++ + ct ct - 580 - 45 - 5 94 CV ct What is the genetic map of these three loci? - 592 40 3 89 3

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Certainly! Here's the transcription and explanation for an educational context: --- **Genetic Linkage Study by T.H. Morgan** **6. Experimental Background:** The renowned geneticist, T.H. Morgan, conducted a series of experiments on linkage mapping in *Drosophila*. He developed a series of three-point testcrosses for his mapping studies. **Understanding the Three-Point Testcross:** - **Question:** What is a three-point testcross? (Diagram the genotypes of the parents involved in such a cross.) - **Calculation Task:** How many F1 progeny classes are possible from such a cross? (Provide your calculations for your answer.) **Detailed Experiment: 1_11_2021** In one such experiment, Morgan analyzed the genetic linkage of three genes: - **v (vermillion eye)** - **cv (crossveinless wings)** - **ct (cut wing margin)** These three are mutational phenotypes, with the wildtype exhibiting red eye, crossvein, and normal wing margin. From a three-point testcross, Morgan observed the following progeny distribution: - **v + +**: 580 - **v cv +**: 45 - **v + ct**: 5 - **+ cv +**: 94 - **+ + ct**: 3 - **+ cv ct**: 592 - **v cv ct**: 40 - **+ + +**: 89 **Analysis Question:** - **What is the genetic map of these three loci?** This setup allows researchers to map the genetic distances between the loci by analyzing the distribution of phenotypes among the progeny. **Diagrams and Graphs:** - There are no diagrams or graphs included in the provided content. - To represent the testcross visually, one could draw a genetic linkage map showing the relative positions and distances between the three loci based on recombination frequencies. This educational exercise exemplifies a foundational method used for understanding gene linkage and mapping in genetics. --- This transcription maintains the educational integrity and context necessary for understanding T.H. Morgan's experiment.
Transcribed Image Text:Certainly! Here's the transcription and explanation for an educational context: --- **Genetic Linkage Study by T.H. Morgan** **6. Experimental Background:** The renowned geneticist, T.H. Morgan, conducted a series of experiments on linkage mapping in *Drosophila*. He developed a series of three-point testcrosses for his mapping studies. **Understanding the Three-Point Testcross:** - **Question:** What is a three-point testcross? (Diagram the genotypes of the parents involved in such a cross.) - **Calculation Task:** How many F1 progeny classes are possible from such a cross? (Provide your calculations for your answer.) **Detailed Experiment: 1_11_2021** In one such experiment, Morgan analyzed the genetic linkage of three genes: - **v (vermillion eye)** - **cv (crossveinless wings)** - **ct (cut wing margin)** These three are mutational phenotypes, with the wildtype exhibiting red eye, crossvein, and normal wing margin. From a three-point testcross, Morgan observed the following progeny distribution: - **v + +**: 580 - **v cv +**: 45 - **v + ct**: 5 - **+ cv +**: 94 - **+ + ct**: 3 - **+ cv ct**: 592 - **v cv ct**: 40 - **+ + +**: 89 **Analysis Question:** - **What is the genetic map of these three loci?** This setup allows researchers to map the genetic distances between the loci by analyzing the distribution of phenotypes among the progeny. **Diagrams and Graphs:** - There are no diagrams or graphs included in the provided content. - To represent the testcross visually, one could draw a genetic linkage map showing the relative positions and distances between the three loci based on recombination frequencies. This educational exercise exemplifies a foundational method used for understanding gene linkage and mapping in genetics. --- This transcription maintains the educational integrity and context necessary for understanding T.H. Morgan's experiment.
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