What does pronucleus mean?

Definitions for pronucleus
proʊˈnu kli əs, -ˈnyu-; -kliˌaɪpronu·cle·us

This dictionary definitions page includes all the possible meanings, example usage and translations of the word pronucleus.

Princeton's WordNet

  1. pronucleusnoun

    the nucleus of the ovum or sperm after fertilization but before they fuse to form the nucleus of the zygote

Wiktionary

  1. pronucleusnoun

    Either of the two haploid nuclei (of a sperm and ovum) that fuse during fertilization

Wikipedia

  1. Pronucleus

    A pronucleus (pl. pronuclei) is the nucleus of a sperm or egg cell during the process of fertilization. The sperm cell becomes a pronucleus after the sperm enters the ovum, but before the genetic material of the sperm and egg fuse. Contrary to the sperm cell, the egg cell has a pronucleus once it becomes haploid, and not when the sperm cell arrives. Sperm and egg cells are haploid, meaning they carry half the number of chromosomes of somatic cells, so in humans, haploid cells have 23 chromosomes, while somatic cells have 46 chromosomes. The male and female pronuclei do not fuse, although their genetic material does. Instead, their membranes dissolve, leaving no barriers between the male and female chromosomes. Their chromosomes can then combine and become part of a single diploid nucleus in the resulting embryo, containing a full set of chromosomes. The appearance of two pronuclei is the first sign of successful fertilization as observed during in vitro fertilisation, and is usually observed 18 hours after insemination or intracytoplasmic sperm injection (ICSI). The zygote is then termed a two-pronuclear zygote (2PN). Two-pronuclear zygotes transitioning through 1PN or 3PN states tend to develop into poorer-quality embryos than ones who remain 2PN throughout development, and may be significant in embryo selection in in vitro fertilisation (IVF).

ChatGPT

  1. pronucleus

    A pronucleus is the haploid nucleus of a sperm or egg in the stage prior to fertilization. It contains the genetic material contributed by each parent after the gametes have fused during fertilization, but before they have combined to form the single diploid nucleus of the zygote.

Webster Dictionary

  1. Pronucleusnoun

    one of the two bodies or nuclei (called male and female pronuclei) which unite to form the first segmentation nucleus of an impregnated ovum

  2. Etymology: [NL. See Pro-, and Nucleus.]

Wikidata

  1. Pronucleus

    A pronucleus is the nucleus of a sperm or an egg cell during the process of fertilization, after the sperm enters the ovum, but before they fuse. Sperm and egg cells are haploid, meaning they carry half the number of chromosomes. The male and female pronuclei don't fuse, although their genetic material do. Instead, their membranes dissolve, leaving no barriers between the male and female chromosomes. Their chromosomes can then combine and become part of a single diploid nucleus in the resulting embryo, containing a full set of chromosomes. The appearance of two pronuclei is the first sign of successful fertilization as observed during in vitro fertilisation, and is usually observed 18 hours after insemination or ICSI. The zygote is then termed a two-pronuclear zygote. Two-pronuclear zygotes transitioning through 1PN or 3PN states tend to develop into poorer-quality embryos than ones who remain 2PN throughout development, and may be significant in embryo selection in IVF.

Entomology

  1. Pronucleus

    the nucleus of male and female elements, spermatozoa and ova, the union of which forms the nucleus of a fertilized ovum.

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Numerology

  1. Chaldean Numerology

    The numerical value of pronucleus in Chaldean Numerology is: 3

  2. Pythagorean Numerology

    The numerical value of pronucleus in Pythagorean Numerology is: 9

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"pronucleus." Definitions.net. STANDS4 LLC, 2024. Web. 21 May 2024. <https://www.definitions.net/definition/pronucleus>.

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