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Related Concept Videos

Meiosis I01:49

Meiosis I

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 a...
Meiosis I03:09

Meiosis I

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...
Meiosis vs. Mitosis02:57

Meiosis vs. Mitosis

Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
What is Meiosis?01:34

What is Meiosis?

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.
Although meiosis shares similarities with mitosis—both rely on microtubules to...
Meiosis I03:09

Meiosis I

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...
Meiosis vs. Mitosis02:57

Meiosis vs. Mitosis

Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...

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Preparation of Meiotic Chromosome Spreads from Mouse Spermatocytes
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Preparation of Meiotic Chromosome Spreads from Mouse Spermatocytes

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Whence meiosis?

A M Villeneuve1, K J Hillers

  • 1Department of Developmental Biology, Stanford University School of Medicine, Stanford, CA 94305, USA. villen@cmgm.stanford.edu

Cell
|September 27, 2001
PubMed
Summary
This summary is machine-generated.

Sexual reproduction is widespread in eukaryotes, but its evolutionary origins are debated. Recent genomic data offer insights into the initial events that enabled sexual reproduction to emerge.

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Last Updated: Jun 7, 2026

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Molecular biology

Background:

  • Sexual reproduction is the dominant mode of reproduction in eukaryotic organisms.
  • The evolutionary persistence and advantages of sexual reproduction remain a subject of scientific discussion.
  • Understanding the initial emergence of sex is crucial for comprehending eukaryotic evolution.

Purpose of the Study:

  • To explore the potential evolutionary events that facilitated the emergence of sexual reproduction.
  • To leverage recent genomic and functional data to investigate the origins of sex.
  • To provide a framework for understanding the early evolution of eukaryotic sexual reproduction.

Main Methods:

  • Analysis of comparative genomics data.
  • Functional genomic studies.
  • Bioinformatic approaches to reconstruct ancestral states.

Main Results:

  • Identification of key genetic innovations potentially preceding or coinciding with the advent of sex.
  • Hypotheses regarding the selective pressures favoring early forms of sexual reproduction.
  • Reconstruction of plausible evolutionary pathways leading to the establishment of sexual reproduction.

Conclusions:

  • The emergence of sexual reproduction was likely a complex process involving multiple genetic and functional innovations.
  • Genomic and functional data provide valuable tools for investigating the deep evolutionary history of sex.
  • Further research can refine our understanding of the specific events and selective forces that led to the evolution of sex in eukaryotes.