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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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colleen colleen
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10 years ago
In the fruit fly, Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to a male that 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: 

   Phenotypes   Number Observed
   spineless   321
   wild-type     38
   claret, spineless   130
   claret     18
   claret, hairless   309
   hairless, claret, spineless       32
   hairless   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-type F1 heterozygote?
(c) What are the map distances for the three genes? A correct formula with the values "plugged in" for each distance will be sufficient.
(d) What is the coefficient of coincidence? A correct formula with the values "plugged in" will be sufficient.
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Sunshine ☀ ☼
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saviosavio
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10 years ago
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Biology - The only science where multiplication and division mean the same thing.

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colleen Author
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#2
Valued Member
10 years ago
Thank you! How do you answered it so well!?
Sunshine ☀ ☼
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#3
10 years ago
No worries, feel free to post more.
Biology - The only science where multiplication and division mean the same thing.
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#4
3 years ago
Thank you
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#5
3 years ago
Thank you
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#6
3 years ago
Thank you
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#7
3 years ago
thank you
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#8
3 years ago
Thank you
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