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PolyploidyFertilizationSperm-Ovum InteractionsZona PellucidaOvumSpermatozoaFertilization in VitroZygoteEgg ProteinsOocytesSperm AgglutinationAcrosome ReactionOogenesisPloidiesAcrosomePronaseUrochordataGenome, PlantParthenogenesisTriploidyOviductsSwineSperm MotilityDiploidySea UrchinsEmbryo Culture TechniquesCytoplasmic GranulesBlastocystFallopian TubesFernsChromosomes, PlantTetraploidyDNA, PlantExocytosisGenome SizeGene DuplicationNoscapineAchilleaThalictrumSpecies SpecificityCleomeEndoreduplicationEvolution, MolecularGossypiumAngiospermsMitosisEmbryonic and Fetal DevelopmentGenes, DuplicateHybridization, GeneticGenes, ChloroplastAneuploidyPortulacaceaeTragopogonReceptors, Cell SurfaceNocodazoleGenes, PlantGlycoproteinsCalciumPhylogenyCulture MediaCell MembraneAurora KinasesTime FactorsAurora Kinase BApomixisOnagraceaeCattleAneugensReproductive IsolationReproduction, AsexualMegakaryocytesGametogenesis, PlantGenomic InstabilityAcanthaceaeRosaCytokinesisDipsacaceaeSolanaceaeBiological EvolutionEcotypeSyntenyGenetic SpeciationCell CycleBrassica rapaSpindle ApparatusIn Situ Hybridization, FluorescenceContig MappingChromosomes, Artificial, BacterialPanicumPlantsCyclin D3OrganophosphatesGenetic VariationThysanopteraBrassica napusChromosomal InstabilityGene Dosage
ChromosomeAnimalsFast block to polyspermyPrevention of polyspermyPrevents polyspermyMechanismsCalciumFertilizationSpeciesSuccessful
Chromosome1
  • The cell resulting from polyspermy, on the other hand, contains three or more copies of each chromosome-one from the egg and one each from multiple sperm. (wikipedia.org)
Animals3
  • Animals such as sea urchins have a two-step polyspermy prevention strategy, with the fast, but transient, electrical block superseded after the first minute or so by a more slowly developing permanent mechanical block. (wikipedia.org)
  • Electrical blocks are helpful in species where a very fast block to polyspermy is needed, due to the presence of many sperm arriving simultaneously at the egg surface, as occurs in animals such as sea urchins. (wikipedia.org)
  • Polyploidy occurs in plants and not in higher animals. (researchtweet.com)
Fast block to polyspermy2
  • Electrical blocks are helpful in species where a very fast block to polyspermy is needed, due to the presence of many sperm arriving simultaneously at the egg surface, as occurs in animals such as sea urchins. (wikipedia.org)
  • however, it was unlikely to be involved in fast block to polyspermy in the fertilization process in mammals [9]. (lacteoscienelac.com)
Prevention of polyspermy2
  • The prevention of polyspermy in sea urchins depends on a change in the electrical charge across the surface of the egg, which is caused by the fusion of the first sperm with the egg. (wikipedia.org)
  • Prevention of Polyspermy 5. (lacteoscienelac.com)
Prevents polyspermy4
  • The decline in the numbers of sperm that swim to the oviduct is one of two ways that prevents polyspermy in humans. (wikipedia.org)
  • By creating a new barrier and destroying the initial interface between sperm and egg, the cortical reaction prevents polyspermy, or the fertilization of a single egg by multiple sperm. (lacteoscienelac.com)
  • prevents polyspermy is essential for fertilization removes the head of the sperm The most significant factors in sperm transport to the vicinity of the oocyte is: sperm flagellum (tail) vaginal cilia an intact zona pellucida smooth muscle contractions gravity The early stages of cleavage are characterized by: formation of a hollow ball of cells 3. (lacteoscienelac.com)
  • The calcium wave that prevents polyspermy also causes A. the sperm to lose its tail. (lacteoscienelac.com)
Mechanisms2
  • Species that undergo physiological polyspermy have polyploidy-preventing mechanisms that act inside the egg. (wikipedia.org)
  • The purpose of this review is to open a debate as to whether or not oocytes actively repel supernumerary sperm or in nature final sperm : oocyte ratios are so low that polyspermy preventing mechanisms are not necessary. (lacteoscienelac.com)
Calcium2
Fertilization3
  • In biology, polyspermy describes the fertilization of an egg by more than one sperm. (wikipedia.org)
  • Some vertebrates that are both amniote or anamniote, including urodele amphibians, cartilaginous fish, birds and reptiles, undergo physiological polyspermy because of the internal fertilization of their yolky eggs. (wikipedia.org)
  • Fertilization of the egg by more than one sperm, a condition known as polyspermy, results in an offspring with extra sets of chromosomes, which is usually lethal. (lacteoscienelac.com)
Species6
  • Physiological polyspermy is present in some species of vertebrates and invertebrates. (wikipedia.org)
  • Some species utilize physiological polyspermy as the proper mechanism for developing their offspring. (wikipedia.org)
  • This induction plays a very critical role in both physiological polyspermy and monomeric polyspermy species. (wikipedia.org)
  • Electrical polyspermy blocks operate in many animal species, including frogs, clams, and marine worms, but not in the several mammals that have been studied (hamster, rabbit, mouse). (wikipedia.org)
  • In species without an electrical block, polyspermy is usually prevented by secretion of materials that establish a mechanical barrier to polyspermy. (wikipedia.org)
  • Polyspermy, while physiologically possible in some species of vertebrates and invertebrates, is a lethal condition for the human zygote. (lacteoscienelac.com)
Successful1