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Meiosis I

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 I

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 I

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...

Crossing Over

Crossing Over

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.
In order to...

Crossing Over

Crossing Over

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...

Meiosis II

Meiosis II

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 containing...

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Related Experiment Video

Updated: May 27, 2026

Preparation of Meiotic Chromosome Spreads from Mouse Oocytes for Assessment of Synapsis and Recombination

Preparation of Meiotic Chromosome Spreads from Mouse Oocytes for Assessment of Synapsis and Recombination

Published on: July 18, 2025

Meiotic pairing as a polo match.

Sue L Jaspersen¹, R Scott Hawley

¹Stowers Institute for Medical Research, Kansas City, MO 64110, USA. slj@stowers.org

Developmental Cell

|November 15, 2011

Summary

This summary is machine-generated.

Polo kinases are crucial for chromosome pairing in C. elegans. Their recruitment to pairing centers at the nuclear envelope drives chromosome aggregation, pairing, and synapsis during meiosis.

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Using Mouse Oocytes to Assess Human Gene Function During Meiosis I

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Published on: April 10, 2018

Area of Science:

Cell Biology
Genetics
Molecular Biology

Background:

Meiotic chromosome pairing in C. elegans initiates at specific chromosomal sites called pairing centers (PCs).
These PCs associate with the nuclear periphery to begin the pairing process.

Discussion:

The Dernburg and Zetka laboratories investigated the role of Polo kinases in PC function.
Their research focused on how these kinases are recruited to the nuclear envelope at PCs.

Key Insights:

Recruitment of Polo kinases to pairing centers is essential for PC complex aggregation.
This kinase recruitment is vital for successful chromosome pairing and synapsis during meiosis.

Outlook:

Further research can explore the precise molecular mechanisms of Polo kinase action at PCs.
Understanding this process may offer insights into conserved mechanisms of chromosome behavior in other organisms.