In barley, three genes, L, M, and R,
lie near each other on chromosome 5 according to the following
L —–(10 m.u.)—– M —–(20 m.u.)—–
You create a trihybrid plant with recessive alleles linked in
coupling (L M R/l m r) by crossing true-breeding L M
R/L M R and l m r/l m r parents. In a testcross of
the trihybrid, how many L m R/l m r plants would be
expected in a progeny of 1000 if there were no interference?
If the coefficient of coincidence were 0.3, how would this
change your answer?