Table 2.

Estimation of ‘r’ in different cases of linkage.

	Linkage in cis	Linkage in trans
Two inserts	$d=r=1-\sqrt{\frac{4n_1}{n_1+n_2}}$	$d=r=\sqrt{\frac{4n_1}{n_1+n_2}}$
Three inserts of which two are linked	$d=r=1-\sqrt{\frac{16n_1}{n_1+n_2}}$	$d=r=\sqrt{\frac{16n_1}{n_1+n_2}}$

d: distance between two linked inserts, r: frequency of recombination between two linked inserts, n₁: frequency of sensitive seedlings, n₂: frequency of resistant seedlings.