Table 3.

Appearance of zygotes in intra- and interspecies crosses

CrossaMating typeFrequency of zygotesbPresence of homo- or heterokaryonsc
A
 Y184 × Y185 MATα × MAT a 0.40n.p.
 Y169 × Y170 MAT a × MATα 0.30n.p.
 Y184 × Y169 MATα × MAT a 0.22n.p.
 Y244 × Y245 MATα × MAT a 0.30n.p.
B (Y339 × Y345) MATα × MAT a 0.05n.p.
C
 Y184 × Y245 MATα × MAT a 0.26n.p.
 Y185 × Y244 MAT a  × MATα 0.33n.p.
 Y169 × Y244 MAT a  × MATα 0.33n.p.
 Y170 × Y245 MATα × MAT a 0.30n.p.
D
 Y184 × Y345 MATα × MAT a 0.08Homokaryons
 Y184 × Y257 MATα × MAT a 0.10Homokaryons
 Y184 × Y344 MATα × MAT a 0.05Homokaryons
 Y185 × Y339 MAT a  × MATα 0.09n.p.
 Y185 × Y257 MAT a  × MAT a 0.19n.p.
 Y185 × Y344 MAT a  × MAT a 0.15n.p.
E
 Y345 × Y257 MAT a  × MAT a 0.03Homokaryons
 Y345 × Y344 MAT a  × MAT a 0.15Homokaryons
 Y257 × Y344 MAT a  × MAT a 0.07Homokaryons
  • a A, intraspecific crosses within the sensu stricto group; B, intraspecific crosses within the sensu lato group; C, interspecific crosses between yeasts belonging to the sensu stricto group; D, interspecific crosses between yeasts belonging to the sensu stricto and sensu lato groups; E, interspecific crosses between yeasts belonging to the sensu lato group.

  • b Note that the frequency of zygotes is estimated on approximately 1,000 cells.

  • c n.p., not performed.