Explain about dikaryotic phase of fungal life?

Dikaryotic phase is a unique stage in sexual reproduction shown by fungi. During this unusual phase, which is common in many species of fungi, cells contain two distinct nuclei. These two nuclei divide simultaneously as the mycelium grows; growth continues until fusion occurs during karyogamy resulting in diploid condition. It occurs due to delay of karyogamy after plasmogamy( fusion of gametes).   

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some times when two cells fuse, plasmogamy occurs but nucleus do not fuse I.e. karyogamy is delayed
fro this time ploidy no. is n+n
it is called dikaryon condition
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