7. You are helping a chicken company understand some new genetics in their birds

Question

7. You are helping a chicken company understand some new genetics in their birds - they found out that genes for blue feathers and orange feet are segregating in their flocks. They want to see if they can sell these birds to University of Florida Gator fans! They have isolated lines that breed true for either blue feathers and yellow feet or white feathers and orange feet. Crossing these lines yields F1 progeny with blue feathers and yellow feet. Crossing F1 progeny with chickens that have white feathers and orange feet yield the following progeny: 87 Blue feathers, yellow feet White feathers, orange feet Blue feathers, orange feet White feathers, yellow feet 73 34 46 Assuming that the genes are linked, what is the map distance between them in cM?

Explanation / Answer

Answer:

Always recombinant progeny are less number than non-recobinants. So, the recombinant progeny combinations are blue feathers, orange feet and white feathers, yellow feet.

Recombination frequency = (recombinant progeny/total progeny) 100

RF = (80/220)100 = 36.36%

RF(%) = Distance between the genes (cM)

The map distance between the genes = 36.36 cM

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