you are doing a three point cross in Drosophila and notice that most of the phen

Question

you are doing a three point cross in Drosophila and notice that most of the phenotypes are DEF or +++. your double crossovers reveal phenotypes of ++E and +DF. what is the correct order of the genes in ONE of the parental chromosomes? A) DEF B) EDF C) DFE D) +DF E) +FD
Please show work, thank you :) you are doing a three point cross in Drosophila and notice that most of the phenotypes are DEF or +++. your double crossovers reveal phenotypes of ++E and +DF. what is the correct order of the genes in ONE of the parental chromosomes? A) DEF B) EDF C) DFE D) +DF E) +FD
Please show work, thank you :) you are doing a three point cross in Drosophila and notice that most of the phenotypes are DEF or +++. your double crossovers reveal phenotypes of ++E and +DF. what is the correct order of the genes in ONE of the parental chromosomes? A) DEF B) EDF C) DFE D) +DF E) +FD
Please show work, thank you :)

Explanation / Answer

Three point crossover let us know the order of gene in a chromosome and determine the physical distance between each pair of genes.

In this drosophila experiment it was observed that output was generally either wild type ++++

Or triple mutant DEF type

Double crossovers reveal phenotypes of ++E and +DF

So the correct order of the genes in ONE of the parental chromosomes is EDF

So the B) EDF is right

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