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pronucleus

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pronucleus /pro·nu·cle·us/ (-noo´kle-us)
1. the precursor of a nucleus.
2. the haploid nucleus occurring after meiosis in a germ cell.
pro·nu·cle·us (pr-nkl-s)
n.
1. One of two nuclei undergoing fusion in karyogamy.
2. The haploid nucleus of a sperm or egg before fusion of the nuclei in fertilization.
pronucleus
pl. pronuclei; the haploid nucleus of a sex cell.
female pronucleus
the haploid nucleus of the fully mature ovum which loses its nuclear envelope and liberates its chromosomes to meet the synapsis with those from the male pronucleus.
male pronucleus
the nuclear material of the head of a spermatozoon, after it has penetrated the ovum and acquired a pronuclear membrane.
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