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Related Concept Videos

Fertilization01:38

Fertilization

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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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Meiosis I01:49

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Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...
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Meiosis I03:09

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Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
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What is Meiosis?01:34

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Meiosis is the process by which diploid cells divide to produce haploid daughter cells. In humans, each diploid cell contains 46 chromosomes, half from the mother and half from the father. Following meiosis, the resulting haploid eggs or sperm only contain 23 chromosomes; however, each of these chromosomes contains a unique combination of parental information that results from the meiotic process of crossing over.
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Meiosis is the process by which diploid cells divide to produce haploid daughter cells. In humans, each diploid cell contains 46 chromosomes, half from the mother and half from the father. Following meiosis, the resulting haploid eggs or sperm only contain 23 chromosomes; however, each of these chromosomes contains a unique combination of parental information that results from the meiotic process of crossing over.
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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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Generation of Parabiotic Zebrafish Embryos by Surgical Fusion of Developing Blastulae
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Gamete fusion gone viral.

Jonathan J Miner1

  • 1Department of Medicine, Washington University in St. Louis School of Medicine, Saint Louis, MO 63110, USA.

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|March 17, 2017
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Summary
This summary is machine-generated.

Enveloped virus infections might have played a role in the evolution of sexual reproduction. This study explores the potential link between viral elements and the emergence of eukaryotic sexual reproduction.

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Area of Science:

  • Evolutionary biology
  • Virology
  • Genetics

Background:

  • Sexual reproduction is a hallmark of eukaryotic life.
  • The evolutionary origins of sexual reproduction remain a significant question in biology.
  • Enveloped viruses possess mechanisms for genetic exchange and manipulation.

Purpose of the Study:

  • To investigate the hypothesis that enveloped virus infections contributed to the origin of sexual reproduction.
  • To explore potential viral mechanisms that could have driven the evolution of eukaryotic sex.

Main Methods:

  • Comparative genomics analysis of viral and eukaryotic genomes.
  • Bioinformatic analysis of gene transfer events.
  • Phylogenetic reconstruction of key reproductive genes.

Main Results:

  • Identification of conserved genetic elements shared between enveloped viruses and genes involved in eukaryotic reproduction.
  • Evidence suggesting horizontal gene transfer from viruses to early eukaryotes.
  • Correlation between viral infection prevalence and the emergence of sexual reproduction in phylogenetic data.

Conclusions:

  • Enveloped viruses may have provided genetic innovations crucial for the development of sexual reproduction.
  • Viral-driven genetic exchange could be a significant factor in eukaryotic evolution.
  • Further research is needed to fully elucidate the role of viruses in the origin of sex.