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Mary Alexander studied the effects of radiation on mutation rates in he sperm of Drosophila melanogaster. She exposed Drosophila larvae to either 3000 roentgens (r) or 3975 r of radiation, collected the adult males that developed from irradiated larvae, and mated them with nonirradiated females that were homozygous for recessive alleles at eight loci. She then counted the number of F, flies that carried a new mutation at each locus. All mutant flies that appeared were used in subsequent crosses to determine if their mutant phenotypes were heritable. For the roughoid locus, she obtained the following results (M. L. Alexander. 1954. Genetics 39:409-428): Number of Offspring with a mutation at offspring Group the roughoid locus Control (0 r) Irradiated 45,504 49,512 (3000 r) Irradiated 50,159 16 (3975 r)

Mary Alexander studied the effects of radiation on mutation rates in he sperm of Drosophila melanogaster. She exposed Drosophila larvae to either 3000 roentgens (r) or 3975 r of radiation, collected the adult males that developed from irradiated larvae, and mated them with nonirradiated females that were homozygous for recessive alleles at eight loci. She then counted the number of F, flies that carried a new mutation at each locus. All mutant flies that appeared were used in subsequent crosses to determine if their mutant phenotypes were heritable. For the roughoid locus, she obtained the following results (M. L. Alexander. 1954. Genetics 39:409-428): Number of Offspring with a mutation at offspring Group the roughoid locus Control (0 r) Irradiated 45,504 49,512 (3000 r) Irradiated 50,159 16 (3975 r)

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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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Calculate the mutation rates at the roughoid locus for the control group and the two groups of irradiated flies.

Mary Alexander studied the effects of radiation on mutation rates in he sperm of Drosophila melanogaster. She exposed Drosophila larvae to either 3000 roentgens (r) or 3975 r of radiation, collected the adult males that developed from irradiated larvae, and mated them with nonirradiated females that were homozygous for recessive alleles at eight loci. She then counted the number of F, flies that carried a new mutation at each locus. All mutant flies that appeared were used in subsequent crosses to determine if their mutant phenotypes were heritable. For the roughoid locus, she obtained the following results (M. L. Alexander. 1954. Genetics 39:409-428): Number of Offspring with a mutation at offspring Group the roughoid locus Control (0 r) Irradiated 45,504 49,512 (3000 r) Irradiated 50,159 16 (3975 r)
Transcribed Image Text:Mary Alexander studied the effects of radiation on mutation rates in he sperm of Drosophila melanogaster. She exposed Drosophila larvae to either 3000 roentgens (r) or 3975 r of radiation, collected the adult males that developed from irradiated larvae, and mated them with nonirradiated females that were homozygous for recessive alleles at eight loci. She then counted the number of F, flies that carried a new mutation at each locus. All mutant flies that appeared were used in subsequent crosses to determine if their mutant phenotypes were heritable. For the roughoid locus, she obtained the following results (M. L. Alexander. 1954. Genetics 39:409-428): Number of Offspring with a mutation at offspring Group the roughoid locus Control (0 r) Irradiated 45,504 49,512 (3000 r) Irradiated 50,159 16 (3975 r)
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