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Binary Fission

Fission is the division of a single entity into two or more parts, which regenerate into separate entities that resemble the original. Organisms in the Archaea and Bacteria domains reproduce using binary fission, in which a parent cell splits into two parts that can each grow to the size of the original parent cell. This asexual method of reproduction produces cells that are all genetically identical.
Crossing Over01:34

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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
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Crossing over01:34

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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
Crossing Over01:30

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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...
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Binary fission is the primary mode of asexual reproduction in prokaryotes, such as bacteria. It results in the production of two genetically identical daughter cells. This highly efficient process ensures the rapid propagation of bacterial populations under favorable conditions and involves coordinated cellular and molecular events.DNA Replication and SeparationThe process begins with the replication of the bacterial chromosome. The circular DNA molecule unwinds at a specific origin of...

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Transbordando sin alas a través de la hendidura sináptica.

Daniela C Zarnescu1, Konrad E Zinsmaier

  • 1Department of Molecular and Cellular Biology, University of Arizona, Tucson, AZ 85721, USA.

Cell
|October 20, 2009
PubMed
Resumen

La proteína transmembrana Evi actúa como portadora de los morfógenos sin alas (Wnt), facilitando su transferencia a través de la hendidura sináptica entre las neuronas y los músculos. Evi también ayuda en el tráfico de receptores Frizzled-2 en los músculos postsinápticos.

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Área de la Ciencia:

  • Biología celular Biología celular.
  • La neurociencia es la neurociencia.
  • Biología del desarrollo Biología del desarrollo.

Sus antecedentes:

  • Los morfógenos Wnt secretados son cruciales para la comunicación intercelular.
  • Los mecanismos precisos del transporte del morfógeno Wnt entre las células siguen sin caracterizarse en gran medida.

Objetivo del estudio:

  • Para investigar el mecanismo de transferencia del morfogeno Wnt entre las células.
  • Identificar el papel de la proteína transmembrana Evi en el transporte de Wnt.

Principales métodos:

  • El estudio utilizó enfoques genéticos y celulares en un organismo modelo (probablemente Drosophila melanogaster, dada la mención de Wingless).
  • Investigó la localización y función de la proteína Evi en relación con la señalización Wnt.

Principales resultados:

  • La proteína transmembrana Evi funciona como un portador versátil para los morfógenos sin alas (Wnt).
  • Evi guía a Wingless a los terminales presinápticos de las neuronas motoras y facilita su transporte a través de la hendidura sináptica.
  • En los músculos postsinápticos, Evi promueve el tráfico del receptor Frizzled-2, un receptor Wnt clave.

Conclusiones:

  • Evi juega un papel crítico en la mediación del transporte del morfogén Wnt en la sinapsis.
  • Este mecanismo pone de relieve una nueva vía para la entrega dirigida de morfógeno esencial para la comunicación y el desarrollo celular.