Gene linkage – crossing over and genetic mapping

BiologyGeneticsAges 17–18

Two genes sit on the same chromosome: drag the distance between them to change the recombination frequency and watch the ratio of the four gamete types (the two parental gametes dominate, while the two recombinant gametes are always equal and each make up f/2). Work backwards from the observed gamete ratio to estimate the map distance in centiMorgans.