In the fruit fly, Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to...
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In the fruit fly, Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to a male which is claret (dark eyes) and hairless (no thoracic bristles). Phenotypically wild type F1 female progeny were mated to fully homozygous (mutant) males and the following progeny (1000 total) were observed. (4 pts per section) PHENOTYPES spineless wild claret, spineless claret claret, hairless hairless, claret, spineless hairless NUMBER OBSERVED 321 38 130 18 309 32 140 hairless, spineless 12 (a) Which gene is in the middle? (b) With respect to the three genes mentioned in the problem, what are the genotypes of the homozygous parents used in making the phenotypically wild F1 heterozygote? (c) What are the map distances between the three genes? A correct formula with the values "plugged in" for each distance will be sufficient. (d) Draw a linkage map with the caleulated map distances indicated. (e) What is the coefficient of colncidence? Interference? In the fruit fly, Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to a male which is claret (dark eyes) and hairless (no thoracic bristles). Phenotypically wild type F1 female progeny were mated to fully homozygous (mutant) males and the following progeny (1000 total) were observed. (4 pts per section) PHENOTYPES spineless wild claret, spineless claret claret, hairless hairless, claret, spineless hairless NUMBER OBSERVED 321 38 130 18 309 32 140 hairless, spineless 12 (a) Which gene is in the middle? (b) With respect to the three genes mentioned in the problem, what are the genotypes of the homozygous parents used in making the phenotypically wild F1 heterozygote? (c) What are the map distances between the three genes? A correct formula with the values "plugged in" for each distance will be sufficient. (d) Draw a linkage map with the caleulated map distances indicated. (e) What is the coefficient of colncidence? Interference?
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For finding the middle gene in a threepoint cross compares the alleles present in nonrecombinants pr... View the full answer
Related Book For
Statistics for the Life Sciences
ISBN: 978-0321989581
5th edition
Authors: Myra Samuels, Jeffrey Witmer, Andrew Schaffner
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