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In an investigation using Drosophila, an undergraduate student successfully described 2 new genes and named them Marvel and DC genes, respectively. The Marvel gene has two alleles whereby the dominant allele is represented by M and the recessive allele is m. The DC gene also has two alleles where the dominant allele D is dominant to the recessive allele d. Data obtained during the research suggests that perhaps the genes are located on chromosome #7. In attempt to map these new genes to chromosome 7, the PS7 gene (located on chromosome 7, P is a dominant allele, and p is a recessive allele) was used as a marker to perform linkage analysis. In an attempt to locate the genes, the student performed testcrosses using F1 heterozygote flies. The following tables provide the results of the crosses: Table 1 – Results from the testcross: MmPp X mmpp Proportions Phenotypes 1129 MP 1120 Mp 1158 mP 1145 mp Table 2 – Results from the testcross: DdPp X ddpp Proportions Phenotypes 1051 DP 659 Dp 601 dP 1002 dp A) Are the Marvel and DC genes linked to the PS7 marker, respectively ? Provide your reasoning. B) Based on the evidence, are the Marvel and DC genes linked ? Provide your reasoning.

In an investigation using Drosophila, an undergraduate student successfully described 2 new genes and named them Marvel and DC genes, respectively. The Marvel gene has two alleles whereby the dominant allele is represented by M and the recessive allele is m. The DC gene also has two alleles where the dominant allele D is dominant to the recessive allele d. Data obtained during the research suggests that perhaps the genes are located on chromosome #7. In attempt to map these new genes to chromosome 7, the PS7 gene (located on chromosome 7, P is a dominant allele, and p is a recessive allele) was used as a marker to perform linkage analysis. In an attempt to locate the genes, the student performed testcrosses using F1 heterozygote flies. The following tables provide the results of the crosses: Table 1 – Results from the testcross: MmPp X mmpp Proportions Phenotypes 1129 MP 1120 Mp 1158 mP 1145 mp Table 2 – Results from the testcross: DdPp X ddpp Proportions Phenotypes 1051 DP 659 Dp 601 dP 1002 dp A) Are the Marvel and DC genes linked to the PS7 marker, respectively ? Provide your reasoning. B) Based on the evidence, are the Marvel and DC genes linked ? Provide your reasoning.

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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In an investigation using Drosophila, an undergraduate student successfully described 2 new genes and named them Marvel and DC genes, respectively. The Marvel gene has two alleles whereby the dominant allele is represented by M and the recessive allele is m. The DC gene also has two alleles where the dominant allele D is dominant to the recessive allele d. Data obtained during the research suggests that perhaps the genes are located on chromosome #7. In attempt to map these new genes to chromosome 7, the PS7 gene (located on chromosome 7, P is a dominant allele, and p is a recessive allele) was used as a marker to perform linkage analysis. In an attempt to locate the genes, the student performed testcrosses using F1 heterozygote flies. The following tables provide the results of the crosses: Table 1 - Results from the testcross: MmPp X mmpp Proportions Phenotypes 1129 MP 1120 Mp 1158 mP 1145 mp Table 2 – Results from the testcross: DdPp X ddpp Proportions Phenotypes 1051 DP 659 Dp 601 dP 1002 dp A) Are the Marvel and DC genes linked to the PS7 marker, respectively ? Provide your reasoning. B) Based on the evidence, are the Marvel and DC genes linked ? Provide your reasoning.
Transcribed Image Text:In an investigation using Drosophila, an undergraduate student successfully described 2 new genes and named them Marvel and DC genes, respectively. The Marvel gene has two alleles whereby the dominant allele is represented by M and the recessive allele is m. The DC gene also has two alleles where the dominant allele D is dominant to the recessive allele d. Data obtained during the research suggests that perhaps the genes are located on chromosome #7. In attempt to map these new genes to chromosome 7, the PS7 gene (located on chromosome 7, P is a dominant allele, and p is a recessive allele) was used as a marker to perform linkage analysis. In an attempt to locate the genes, the student performed testcrosses using F1 heterozygote flies. The following tables provide the results of the crosses: Table 1 - Results from the testcross: MmPp X mmpp Proportions Phenotypes 1129 MP 1120 Mp 1158 mP 1145 mp Table 2 – Results from the testcross: DdPp X ddpp Proportions Phenotypes 1051 DP 659 Dp 601 dP 1002 dp A) Are the Marvel and DC genes linked to the PS7 marker, respectively ? Provide your reasoning. B) Based on the evidence, are the Marvel and DC genes linked ? Provide your reasoning.
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