4. In Drosophila, the absence of wings (apterous), sepia eye color and ebony abdomen color are...

 

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4. In Drosophila, the absence of wings (apterous), sepia eye color and ebony abdomen color are all recessive traits. Female flies heterozygous for the apterous trait (a* /a), sepia eye color (s /s), and ebony color abdomens (e /e) were test crossed, and the following progeny were obtained (12.0 points): PROGENY PHENOTYPES Wild type Ebony Apterous, ebony Apterous, sepia Apterous, sepia, ebony Sepia Sepia, ebony Apterous NUMBER 355 12 64 8 364 67 75 55 a. Are these genes linked? Justify your answer. b. Write the genotypes of the flies involved in the testcross. c. Write the genes given on a chromosome in the correct order (cis or trans). d. What is the map distance between the loci for ebony and apterous? Show your calculations. e. What is the map distance between the loci for ebony and sepia? Show your calculations. 4. In Drosophila, the absence of wings (apterous), sepia eye color and ebony abdomen color are all recessive traits. Female flies heterozygous for the apterous trait (a* /a), sepia eye color (s /s), and ebony color abdomens (e /e) were test crossed, and the following progeny were obtained (12.0 points): PROGENY PHENOTYPES Wild type Ebony Apterous, ebony Apterous, sepia Apterous, sepia, ebony Sepia Sepia, ebony Apterous NUMBER 355 12 64 8 364 67 75 55 a. Are these genes linked? Justify your answer. b. Write the genotypes of the flies involved in the testcross. c. Write the genes given on a chromosome in the correct order (cis or trans). d. What is the map distance between the loci for ebony and apterous? Show your calculations. e. What is the map distance between the loci for ebony and sepia? Show your calculations.

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Answer4a yes these three genes are linked because parental genotypes are more in number as compare... View the full answer