FIG. 2.

Mitotic recombination in diploids. A diploid containing leu2 heteroalleles and heterozygous for HIS4 is shown. Gene conversion associated with crossing over gives rise to Leu⁺ His⁺ or Leu⁺ His⁻ recombinants, whereas gene conversion events maintain heterozygosity at HIS4. A BIR event cannot be distinguished from a G₂ crossover unless the reciprocal product is recovered.