Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 25, Problem 25.4CC
Summary Introduction
To determine: Whether the given information can be used to determine the order of genes A, B, and C on the same chromosome.
Introduction: Genes lying closely together on the same chromosome can be used to observe a pattern of segregation. Experiments conducted on fruit flies by Morgan depicted that the distance between the two genes lying on the same chromosome may give a measure of the frequency of their recombination. Genes lying far apart from each other show more chances of being separated by a crossover.
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Suppose researchers studied the first chromosome of a new species and mapped three genes of interest, indicated as a, b, and c. A three‑factor cross was performed and the number of gametes formed from the F2 generation was recorded in a table. Note that the order of genes in the table is arbitrary.
Calculate the recombination frequencies for each given gene pair in map units.
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After completing the gene mapping, the researchers treated individuals to induce inversions in the chromosomes. After treatment, another three‑factor cross was performed and the number of gametes formed from the F2 generation was recorded in a second table. Note that the order of genes in the table is arbitrary.
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Calculate the recombination frequencies for each given gene pair in map units.
Suppose researchers studied the first chromosome of a new species and mapped three genes of interest, indicated as a, b, and c. A three‑factor cross was performed and the number of gametes formed from the F2 generation was recorded in a table. Note that the order of genes in the table is arbitrary.
Calculate the recombination frequencies for each given gene pair in map units.
a+ b+ c+
a b c
a b+ c+
a+ b c
a b+ c
a+ b c+
a b c+
a+ b+ c
173
176
35
33
11
10
3
1
After completing the gene mapping, the researchers treated individuals to induce inversions in the chromosomes. After treatment, another three‑factor cross was performed and the number of gametes formed from the F2 generation was recorded in a second table. Note that the order of genes in the table is arbitrary.
a+ b+ c+
abc
a b+ c+
?+ b c
a b+ c
a+ b c+
a b c+
a+ b+ c
188
185
24
26
1
0
49
46
Calculate the recombination frequencies for each given gene pair in map units.
Assume you are mapping genes A, B, C, and D in Drosophila. You know that these genes are linked on the same chromosome, and you determine the recombination frequencies between each pair of genes to be as follows: A–B, 8%; A– C, 28%; A–D, 25%; B–C, 20%; B–D, 33%. (a) Describe how you determined the recombination frequency for each pair of genes. (b) Draw a chromosome map based on your data.
Chapter 25 Solutions
Becker's World of the Cell (9th Edition)
Ch. 25 - Cloning can be done by somatic cell nuclear...Ch. 25 - If the DNA content of a diploid cell in the G1...Ch. 25 - Prob. 25.3CCCh. 25 - Prob. 1QCh. 25 - Prob. 25.4CCCh. 25 - What do you think would happen to a pathogenic...Ch. 25 - Prob. 25.6CCCh. 25 - The Truth About Sex. For each of the following...Ch. 25 - Ordering the Phases of Meiosis. Drawings of...Ch. 25 - Telling Them Apart. Briefly describe how you might...
Ch. 25 - Prob. 25.4PSCh. 25 - More about DNA. Let X be the amount of DNA present...Ch. 25 - Meiotic Mistakes. Infants born with Patau syndrome...Ch. 25 - Prob. 25.7PSCh. 25 - QUANTITATIVE Punnett Squares as Genetic Tools. The...Ch. 25 - QUANTITATIVE Genetic Mapping. The following table...Ch. 25 - Prob. 25.10PSCh. 25 - Prob. 25.11PS
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