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After fertilization the nucleus of the egg divides, the first stages of karyokinesis being apparent even before complete fusion of the male and female nuclei has occurred.
He finds that eight chromosomes appear in karyokinesis in the ordinary thallus cells, but sixteen in the gonimoblast filaments derived from the fertilized carpogonium.
Amitosis is probably connected by a series of intermediate gradations with karyokinesis.
Nuclear division is usually accompanied by all the essential features of karyokinesis.