You are given a Drosophila female that looks wild-type but is heterozygous for mutations in tan body (t), miniature wings (m), and white eyes (w). You test cross this female with a tan bodied, miniature winged, and white-eyed homozygous mutant male, and you obtain the following 1400 progeny: Phenotype : number + + + : 608 t m w : 516 + m w : 2 t + + : 6 + m + : 39 t + w : 46 + + w : 81 t m + : 102 Calculate the distance between each pair t-m, m-w, and t-w only using the number of recombinants between them (i.e. ignoring the gene in the middle). Draw a linear map with the distances between genes.

You are given a Drosophila female that looks wild-type but is heterozygous for mutations in tan body (t), miniature wings (m), and white eyes (w). You test cross this female with a tan bodied, miniature winged, and white-eyed homozygous mutant male, and you obtain the following 1400 progeny: Phenotype : number + + + : 608 t m w : 516 + m w : 2 t + + : 6 + m + : 39 t + w : 46 + + w : 81 t m + : 102 Calculate the distance between each pair t-m, m-w, and t-w only using the number of recombinants between them (i.e. ignoring the gene in the middle). Draw a linear map with the distances between genes.

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter13: Genes, Chromosomes, And Human Genetics

Section: Chapter Questions

Problem 8TYK: Another gene in Drosophila determines wing length. The dominant wild-type allele of this gene...

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From a Drosophila testcross, the number of each phenotype obtained was as follows: W+ m f+ 218 W m+ f 236 W+ m+ f 168 W m f+ 178 W+ m f 95 W m+ f+ 101 W+ m+ f+ 3 W m f 1 Total, 1000 Construct a genetic map.
Male Drosophila expressing the autosomal recessivemutations sc (scute), ec (echinus), cv (crossveinless),and b (black) were crossed to phenotypically wildtype females, and the 3288 progeny listed wereobtained. (Only mutant traits are noted.)653 black, scute, echinus, crossveinless670 scute, echinus, crossveinless675 wild type655 black71 black, scute73 scute73 black, echinus, crossveinless74 echinus, crossveinless87 black, scute, echinus84 scute, echinus86 black, crossveinless83 crossveinless1 black, scute, crossveinless1 scute, crossveinless1 black, echinus1 echinusa. Diagram the genotype of the female parent.b. Map these loci.c. Do the data provide evidence of interference?Justify your answer with numbers.
Three recessive mutations in Drosophila melanogaster, roughoid (ru, small rough eyes), javelin (jv, cylindrical bristles), and sepia eyes (se, dark brown eyes) are linked. A three-point cross was carried out and the following progeny obtained: jv+ ru+ se+ 37 jv+ ru+ se 2 jv+ ru se 14 jv+ ru se+ 146 jv ru se+ 2 jv ru se 35 jv ru+ se 154 jv ru+ se+ 10 a. Determine the order of the genes on the chromosome. b. Determine which progeny contain single crossovers and which contain double crossovers and indicate where among the genes the crossovers occurred. c. Calculate the map distances among the genes. d. Calculate the coefficient of coincidence and interference among the genes
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