Abstract
In some fungi-ascomycetes and basidiomycetes, the 4 haploid spores formed as a result of meiosis can fuse in pairs, forming a dikaryon or diploid. The consequence of such intratetrad mating is the preservation of heterozygosity of genes linked to the mating-type (MAT) locus. If the MAT is linked to the centromere physically or genetically (as a result of the suppression of recombination), the centromere regions of all chromosomes are preserved in a heterozygous state. Suppression of recombination in the MAT chromosome contributes to the accumulation of lethal mutations and chromosomal rearrangements in it. Two MAT chromosomes cease to be homologous and become analogues of the sex chromosomes of animals and plants.
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