inkage mapping Linkage mapping is done using test crosses a b/a B x a b/a b 00 Parental a B 25 Recombinant Ab 25 Recombinant A B 100 Parental R=# recombinant progeny/fTotal progeny X 100=CM R=50250X100=20cMLinkage mapping • Linkage mapping is done using test crosses. a b / A B X a b / a b a b 100 Parental a B 25 Recombinant A b 25 Recombinant A B 100 Parental R = # recombinant progeny/ #Total progeny X 100 = cM R = 50/250 X 100 = 20 cM