TABLE 1.

Genetic distances across a common a1–sh2 interval in three genetic backgrounds

Genetic background	No. isolateda	No. recoveredb	No. testedc	No. confirmedd	No. correct recombinantse	Population sizes	Genetic distances (cM)f
A632/LC	229	138	130	130	229	320,718	0.143 ± 0.000667
Oh43/LC	323	188	188	178	306	758,271	0.081 ± 0.00033
W64A/LC	442	219	219	219	442	704,077	0.126 ± 0.000442

^aNumber of putative colored shrunken recombinants isolated from cross 2 (materials and methods).

^bNumber of putative recombinants successfully propagated.

^cNumber of putative recombinants whose validity was tested (materials and methods).

^dNumber of putative recombinants confirmed.

^eNumber of correct recombinants = no. isolated × (no. confirmed/no. tested).

^fGenetic distance = 100 × no. correct recombinants × 2/population size. Because colorless round recombinants were not isolated, genetic distances were calculated by multiplying the number of colored shrunken recombinants by two. Standard errors were calculated according to the formula (pq/n)^1/2. The genetic distances among genetic backgrounds varied significantly (P < 0.03).