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To determine whether the mutations in the seven strains leading to the wingless phenotype are in the same gene, your lab sets up complementation tests. You obtain the following results ("+" indicates that complementation was observed; "-" indicates that no complementation was observed).

mutation 1 2 3 4 5 6 7
1 -
2 - -
3 + + -
4 - - + -
5 + + - + -
6 + + - + - -
7 - - + - + + -
How many different genes are contributing to the wingless phenotypes in these mutant fly strains?

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Answer:

Two genes.  

There are two change gatherings:  

Changes 1,2,4, and 7 didn't supplement one another, and thus are on a similar quality.  

Changes 3, 5 and 6 didn't supplement one another, however supplemented with transformations 1, 2, 4, and 7. Thus, these three transformations are available together on an alternate quality.

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