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Spermatogenesis

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...

Spermatogenesis

Spermatogenesis

Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...

Sperm Transport

Sperm Transport

The journey of sperm from its origin to the point of ejaculation begins within the seminiferous tubules of the testis. Here, Sertoli cells produce fluid that propels non-motile sperm through a series of conduits, starting with the straight tubules leading to the rete testis. This interconnected network of tubules acts as the initial pathway for sperm, guiding them into the efferent ductules and then into the epididymis for maturation.
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Nondisjunction

Nondisjunction

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers. Nondisjunction is common during anaphase I or anaphase II of meiosis. Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...

Oogenesis

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...

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...

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Related Experiment Video

Updated: Jul 8, 2026

Flow Cytometric Analysis of Biomarkers for Detecting Human Sperm Functional Defects

Flow Cytometric Analysis of Biomarkers for Detecting Human Sperm Functional Defects

Published on: April 21, 2022

Evolutionary consequences of sperm cell aging.

Klaus Reinhardt¹

¹Department of Animal and Plant Sciences, University of Sheffield, Western Bank, UK. K.REINHARDT@SHEFFIELD.AC.UK

The Quarterly Review of Biology

|January 26, 2008

Summary

This summary is machine-generated.

Sperm age significantly impacts fertilization success. This study reveals how male and female traits influence sperm aging, explaining sexual selection and paternity variation without genetic incompatibility.

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Sperm Collection of Differential Quality Using Density Gradient Centrifugation

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Published on: November 29, 2018

Area of Science:

Reproductive biology
Sexual selection
Cellular biogerontology

Background:

Fertilization rates and zygote viability are critically dependent on sperm age.
Sexual selection research traditionally overlooks the impact of sperm age on male genotype performance.
A combined view of sperm aging and sexual selection is underexplored.

Purpose of the Study:

To integrate the concept of sperm age into sexual selection research.
To identify male and female traits that influence sperm aging or sperm age distribution.
To explain sexually selected traits and paternity variation through the lens of sperm aging.

Main Methods:

Review and synthesis of existing literature in animal breeding, reproductive biology, and biogerontology.
Analysis of how various reproductive strategies and traits affect sperm aging.
Connecting observed sexually selected traits to mechanisms influencing sperm age distribution.

Main Results:

Numerous male and female traits affect sperm aging and its distribution during reproduction.
These traits align with known condition-dependent, sexually selected characteristics.
Examples include multiple mating, high sperm production, ejaculate density, spermatophores, sperm ejection, sexual coercion, and antioxidant/repair mechanisms.

Conclusions:

Altering sperm age distribution at any reproductive stage can drive the evolution of sexually selected traits.
Sperm aging provides a novel framework for understanding paternity variation.
This perspective can explain observed paternity variation without invoking gametic genetic incompatibility.