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There are 2 nuclei present in a zygote one of the sperm and other of the ovum as zygote is the cell which is formed by the fertilization of both the sperm and ovum.
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this what our teachers explained us in the class
Hi...The zygote is formed by two haploid cell which have half number of chromosomes Sperm(n) and egg(n) form a diploid Zygote(2n)  having a single nucleus .. if the zygote will split into two, after two days it'll form twins.
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