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Videos de Conceptos Relacionados

Fertilization01:38

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During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
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Cleavage and Blastulation01:33

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After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
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Meiosis II01:57

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Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each...
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Meiosis II02:02

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Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
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The Angiosperm Life Cycle02:39

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Plants have a life cycle split between two multicellular stages: a haploid stage—with cells containing one set of chromosomes—and a diploid stage—with cells containing two sets of chromosomes. The haploid stage is the gamete-producing gametophyte, and the diploid stage is the spore-producing sporophyte.
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Zygotic Development And Stem Cell Formation01:10

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The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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Evaluation of Fertilization State by Tracing Sperm Nuclear Morphology in Arabidopsis Double Fertilization
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Evaluation of Fertilization State by Tracing Sperm Nuclear Morphology in Arabidopsis Double Fertilization

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Fusiones de tres células durante la fertilización doble.

Stefanie Sprunck1, Thomas Dresselhaus1

  • 1Cell Biology and Plant Biochemistry, Biochemie-Zentrum Regensburg, University of Regensburg, 93053 Regensburg, Germany.

Cell
|May 11, 2015
PubMed
Resumen
Este resumen es generado por máquina.

Las plantas con flores exhiben una fusión única de la tercera célula después de la fertilización. Este evento en Arabidopsis diluye rápidamente los atrayentes del tubo de polen, evitando múltiples entradas en el tubo de polen (polytubey).

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Área de la Ciencia:

  • Biología reproductiva de las plantas Biología reproductiva de las plantas
  • Biología molecular y celular Biología molecular y celular
  • Biología del desarrollo Biología del desarrollo.

Sus antecedentes:

  • Las plantas con flores se distinguen por la doble fertilización, que implica la fusión con el huevo y la célula central.
  • La prevención de múltiples entradas en el tubo de polen (polytubey) es crucial para la reproducción exitosa en las plantas.

Objetivo del estudio:

  • Para investigar posibles eventos de fusión celular más allá de la doble fecundación canónica en Arabidopsis.
  • Para dilucidar los mecanismos que impiden la politubia después de la fertilización.

Principales métodos:

  • Microscopía confocal en la especie Arabidopsis thaliana.
  • Análisis de la localización de proteínas fluorescentes y la morfología celular.
  • Investigando la señalización de guía del tubo de polen.

Principales resultados:

  • Se identificó un nuevo evento de fusión de la tercera célula entre el sinérgico persistente y la célula central fertilizada.
  • Esta fusión ocurre poco después de la doble fecundación.
  • La fusión diluye rápidamente los atrayentes del tubo de polen, evitando efectivamente el polytubey.

Conclusiones:

  • Arabidopsis posee un mecanismo no descrito previamente que implica una fusión de la tercera célula para asegurar la fidelidad reproductiva.
  • Esta fusión celular sinérgica-central juega un papel crítico en la prevención de la politubia, salvaguardando el proceso de fertilización.