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4. In Drosophila melanogaster the wild-type eye colour is dark red. A pure-breeding mutant strain with brown eyes also exists. When brown-eyed flies are crossed to wild-type flies all of the Fi progeny are dark red-eyed. Fi flies were intercrossed and the F2 analvsed. In a total of 200 F2 flies there were 141 wild- type flies and 59 brown-eyed flies. There was no difference in the result between male and female F2 progeny. Some F1 flies were test crossed to brown-eyed flies and of 88 progeny, 48 were wild- type and 40 were brown-eyed with no differences between the sexes. - Interpret these results as fully as possible.

4. In Drosophila melanogaster the wild-type eye colour is dark red. A pure-breeding mutant strain with brown eyes also exists. When brown-eyed flies are crossed to wild-type flies all of the Fi progeny are dark red-eyed. Fi flies were intercrossed and the F2 analvsed. In a total of 200 F2 flies there were 141 wild- type flies and 59 brown-eyed flies. There was no difference in the result between male and female F2 progeny. Some F1 flies were test crossed to brown-eyed flies and of 88 progeny, 48 were wild- type and 40 were brown-eyed with no differences between the sexes. - Interpret these results as fully as possible.

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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4. In Drosophila melanogaster the wild-type eye çolour is dark red. A pure-breeding mutant strain with brown eyes also exists. When brown-eyed flies are crossed to wild-type flies all of the Fi progeny are dark red-eyed. F1 flies were intercrossed and the F2 analvsed. In a total of 200 F2 flies there were 141 wild- type flies and 59 brown-eyed flies. There was no difference in the result between male and female F2 progeny. Some F1 flies were test crossed to brown-eyed flies and of 88 progeny, 48 were wild- type and 40 were brown-eyed with no differences between the sexes. - Interpret these results as fully as possible. b) A cross between two wild-type flies gave progeny all of which were wild type. When they were test crossed to flies the following results were obtained: vg e i) % of the test crosses gave wild type, westigal ebony, vestigal and ebony in a 1:1:1:1 ratio. ii) 4 of the test crosses gave all wild type. iii) % of the test crosses gave yestigal and wild type in a 1:1 ratio. iv) 4 of the test crosses gave ebony and wild type in a 1:1 ratio. What are genotypes of the original pair of wild-type flies?
Transcribed Image Text:4. In Drosophila melanogaster the wild-type eye çolour is dark red. A pure-breeding mutant strain with brown eyes also exists. When brown-eyed flies are crossed to wild-type flies all of the Fi progeny are dark red-eyed. F1 flies were intercrossed and the F2 analvsed. In a total of 200 F2 flies there were 141 wild- type flies and 59 brown-eyed flies. There was no difference in the result between male and female F2 progeny. Some F1 flies were test crossed to brown-eyed flies and of 88 progeny, 48 were wild- type and 40 were brown-eyed with no differences between the sexes. - Interpret these results as fully as possible. b) A cross between two wild-type flies gave progeny all of which were wild type. When they were test crossed to flies the following results were obtained: vg e i) % of the test crosses gave wild type, westigal ebony, vestigal and ebony in a 1:1:1:1 ratio. ii) 4 of the test crosses gave all wild type. iii) % of the test crosses gave yestigal and wild type in a 1:1 ratio. iv) 4 of the test crosses gave ebony and wild type in a 1:1 ratio. What are genotypes of the original pair of wild-type flies?
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