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In mice, three recessive genes (rg, mg, and at) are linked on chromosome 3. A homozygous...

In mice, three recessive genes (rg, mg, and at) are linked on chromosome 3. A homozygous mouse for the recessive genes is crossed with a wild-type mouse. The F1 is testcrossed to get an F2 generation with the following results:

at rg +           1                      at   +   +         15

+ rg +           69                    at rg mg         36

+ + mg          1                      + rg mg         9

at + mg         76                    +   +   +         16

What is the gene order?

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Answer=rg-at-mg

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