  In simulations of sexual reproduction with diploid individuals, we introduce
that female haploid gametes recognize one specific allele of the genomes as a
marker of the male haploid gametes. They fuse to zygotes preferrably with male
gametes having a different marker than their own. This gamete recognition
enhances the advantage of complementary bit-strings in the simulated diploid
individuals, at low recombination rates. Thus with rare recombinations the
bit-string evolve to be complementary; with recombination rate above about 0.1
instead they evolve under Darwinian purification selection, with few bits
mutated.
