We are interested in detremining the genetic map of three different house finch

Question

We are interested in detremining the genetic map of three different house finch traits: beak color (dark vs light), song length (short vs long) and patch size (reduced vs normal). We have done a large experiment involving the usual P0 crossed, with the F1 test crossed. The following are the data for the offspring from the test cross:

Choose the map below that best fits the data

Select one:

Beak Shade - 15.81cM - Patch Size - 9.70cM - Song Length

Beak Shade - 9.70cM - Patch Size - 15.81cM - Song Length

Patch Size - 15.81cM - Song Length - 9.70cM - Beak Shade

Patch Size - 9.70cM - Song Length - 15.81cM - Beak Shade

Patch Size - 15.81cM - Beak Shade - 9.70cM - Song Length

Patch Size - 9.70cM - Beak Shade - 15.81cM - Song Length

Beak Shade Patch Size Song Length Number Observed Light Reduced Long 61 Light Reduced Short 16 Light Normal Short 313 Light Normal Long 46 Dark Normal Long 12 Dark Normal Short 87 Dark Reduced Short 34 Dark Reduced Long 544

Explanation / Answer

Beak Shade - 15.81cM - Patch Size - 9.70cM - Song Length is the map that best fits the data. This is because cross over frequently occurs if two genes are far apart. In the given data Dark Reduced Long phenotypes are 544 that implies gene for beak shade is far from the gene from patch size and song length.   

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