Three recessive genes on chromosome 2 of Drosophila melanogaster are: welt, vest

Question

Three recessive genes on chromosome 2 of Drosophila melanogaster are: welt, vestigial, and black. The numbers of phenotypes from a trihybrid test cross are shown below: Wild type 719 welt , vestigial , black 667 welt 148 vestigial , black 132 black 2188 welt , vestigial 2107 vestigial 753 welt black 726 What is the gene order and map distance between the three genes and what is the percent interference? Please type the answer. Including the full explanation of the question and the solution with details.

Explanation / Answer

the gene order is first the black genes comes, then welt and finally the vestigial.

The distance between the three genes is

(west,vestigial,black)-(vestigial,black)-(welt)=667-132-148=387

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