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Below are the results from a 3 gene testcross between an XxYyZz plant and an xxyyzz plant: Testcross outcome: XYZ 365 xyz 367 xYz 110 XyZ 105 XYZ 3 Xyz 4 XYZ 25 xyZ 21 1. Determine the order of these genes on the chromosome. Indicate them on the diagram below. 2. Calculate the map distances between the genes (give you answer as map units). Indicate these distances on the diagram above. 3. Determine the coefficient of coincidence. 4. Determine the interference among these genes.

Below are the results from a 3 gene testcross between an XxYyZz plant and an xxyyzz plant: Testcross outcome: XYZ 365 xyz 367 xYz 110 XyZ 105 XYZ 3 Xyz 4 XYZ 25 xyZ 21 1. Determine the order of these genes on the chromosome. Indicate them on the diagram below. 2. Calculate the map distances between the genes (give you answer as map units). Indicate these distances on the diagram above. 3. Determine the coefficient of coincidence. 4. Determine the interference among these genes.

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
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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### Results from a Three-Gene Testcross **Objective:** Below are the results from a three-gene testcross between an XxYyZz plant and an xxyyzz plant: #### Testcross Outcome: - **XYZ**: 365 - **xyz**: 367 - **xYz**: 110 - **XyZ**: 105 - **xYZ**: 3 - **Xyz**: 4 - **XYz**: 25 - **xyZ**: 21 #### Questions: 1. **Determine the order of these genes on the chromosome. Indicate them on the diagram below.** 2. **Calculate the map distances between the genes (give your answer as map units). Indicate these distances on the diagram above.** 3. **Determine the coefficient of coincidence.** 4. **Determine the interference among these genes.** #### Detailed Explanation: - **Gene Order**: To determine the gene order, look at the frequency of crossing over between each pair of genes. This typically correlates with distances on the chromosome. - **Map Distances**: Map units, or centimorgans, represent the frequencies of recombination events between each gene pair. Calculate these by finding the percentage of recombinants compared to the total number of offspring. - **Coefficient of Coincidence and Interference**: The coefficient of coincidence is the ratio of observed double crossovers to expected double crossovers. Interference indicates the degree to which one crossover event interferes with another and is calculated as `1 - coefficient of coincidence`. This data would aid students in understanding genetic linkage, recombination, and the usage of testcrosses to map gene loci on chromosomes.
Transcribed Image Text:### Results from a Three-Gene Testcross **Objective:** Below are the results from a three-gene testcross between an XxYyZz plant and an xxyyzz plant: #### Testcross Outcome: - **XYZ**: 365 - **xyz**: 367 - **xYz**: 110 - **XyZ**: 105 - **xYZ**: 3 - **Xyz**: 4 - **XYz**: 25 - **xyZ**: 21 #### Questions: 1. **Determine the order of these genes on the chromosome. Indicate them on the diagram below.** 2. **Calculate the map distances between the genes (give your answer as map units). Indicate these distances on the diagram above.** 3. **Determine the coefficient of coincidence.** 4. **Determine the interference among these genes.** #### Detailed Explanation: - **Gene Order**: To determine the gene order, look at the frequency of crossing over between each pair of genes. This typically correlates with distances on the chromosome. - **Map Distances**: Map units, or centimorgans, represent the frequencies of recombination events between each gene pair. Calculate these by finding the percentage of recombinants compared to the total number of offspring. - **Coefficient of Coincidence and Interference**: The coefficient of coincidence is the ratio of observed double crossovers to expected double crossovers. Interference indicates the degree to which one crossover event interferes with another and is calculated as `1 - coefficient of coincidence`. This data would aid students in understanding genetic linkage, recombination, and the usage of testcrosses to map gene loci on chromosomes.
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