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In Drosophila melanogaster, curled wings (cu) was one of the first mutants described by

In Drosophila melanogaster, curled wings (cu) was one of the first mutants described by

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
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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1. In Drosophila melanogaster, curled wings (cu) was one of the first mutants described by Thomas Hunt Morgan more than 100 years ago (in 1915). The gene for curled wings is on the same chromosome as the gene for the mutant sepia eyes (se). They are 24 map units apart on chromosome 3. Both traits are encoded by two mutant alleles that are recessive to those that produce wild-type traits (cu+ and se+). A fly that is homozygous for sepia eyes and curled wings is crossed with a fly homozygous for the wild- type traits. The F1 generation all have the wild type phenotype. In a testcross, the F1 progeny are mated with flies that have sepia eyes and curled wings. 1a. Create a drawing to show the chromosomes, allele arrangements and phenotypes of the F 1 parents in the testcross and the nonrecombinant and recombinant F 2 progeny produced from the testcross. 1b. If 360 offspring are produced in F1 testcross, what is the number of progeny expected for each F2 phenotypic class? 1c. Is the F1 heterozygote in coupling or repulsion?
Transcribed Image Text:1. In Drosophila melanogaster, curled wings (cu) was one of the first mutants described by Thomas Hunt Morgan more than 100 years ago (in 1915). The gene for curled wings is on the same chromosome as the gene for the mutant sepia eyes (se). They are 24 map units apart on chromosome 3. Both traits are encoded by two mutant alleles that are recessive to those that produce wild-type traits (cu+ and se+). A fly that is homozygous for sepia eyes and curled wings is crossed with a fly homozygous for the wild- type traits. The F1 generation all have the wild type phenotype. In a testcross, the F1 progeny are mated with flies that have sepia eyes and curled wings. 1a. Create a drawing to show the chromosomes, allele arrangements and phenotypes of the F 1 parents in the testcross and the nonrecombinant and recombinant F 2 progeny produced from the testcross. 1b. If 360 offspring are produced in F1 testcross, what is the number of progeny expected for each F2 phenotypic class? 1c. Is the F1 heterozygote in coupling or repulsion?
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