Abstract
In the loach Misgurnus anguillicaudatus (Pisces: Cobitidae), triploid females derived from the hybridization of normal diploid females and natural tetraploid males generate both triploid and haploid eggs simultaneously. Diploid progenies were produced by fertilizing the haploid eggs of triploids with haploid spermatozoa of normal diploids. Ldh-1 and Mdh-2 allozyme loci were electrophoretically diagnostic, because diploid and tetraploid loach exhibited the diverged genotype aa and bbbb at each locus, respectively. Diploids from triploid (abb) × diploid (aa) crosses frequently exhibited a heterozygous ab genotype at each locus but sometimes showed genotypic frequencies that fit a random pairing model (aa:ab = 1:2) of two of three chromosomes in each set of homologues. These results show that the entire haploid genome of one parent is not completely excluded in the oogenesis of triploid loach, and the haploid eggs are not formed in a typical hybridogenetic manner. However, the two homologous chromosomes derived from the tetraploid parent are likely to pair with each other preferentially during the meiosis of triploid loach. J. Exp. Zool. 280:368–374, 1998. © 1998 Wiley-Liss, Inc.
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