Related Experiment Video

Updated: Jul 15, 2026

Avian Semen Collection by Cloacal Massage and Isolation of DNA from Sperm
07:40

Avian Semen Collection by Cloacal Massage and Isolation of DNA from Sperm

Published on: February 5, 2018

The evolution of sperm morphometry in pheasants

S Immler1, M Saint-Jalme, L Lesobre

  • 1Department of Animal and Plant Sciences, University of Sheffield, Sheffield, UK. s.immler@sheffield.ac.uk

Journal of Evolutionary Biology
|May 1, 2007
PubMed

More Related Videos

Sperm Collection of Differential Quality Using Density Gradient Centrifugation03:28

Sperm Collection of Differential Quality Using Density Gradient Centrifugation

Published on: November 29, 2018

Assessing Differences in Sperm Competitive Ability in Drosophila09:34

Assessing Differences in Sperm Competitive Ability in Drosophila

Published on: August 22, 2013

Related Concept Videos

Spermatogenesis01:41

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...
Mate Choice01:20

Mate Choice

Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
Sperm Structure and Semen Composition01:22

Sperm Structure and Semen Composition

During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...