Spermatogenesis sequence

Référence de la vidéo 11936697
Spermatogenesis sequence. Animation showing the genetic and cellular changes in the process of spermatogenesis, the production of sperm cells (male gametes). This is the cellular basis of the male part of sexual reproduction, and takes place in the testes. The process starts with a spermatogonium (upper left). These are formed by mitosis, remaining diploid (2n) with two sets of chromosomes (red and blue). The following stage is the formation of a primary spermatocyte (lower centre), which is also diploid. This is followed by the first meiotic division (meiosis), reducing the number of chromosomes and producing a haploid (n) secondary spermatocyte (upper centre). This is followed by further (secondary) meiotic division (actually mitosis) to produce four spermatids (upper right). These then develop into sperm (spermatozoa, lower right), with a tail for propulsion. For this animation without labels, see K004/2009.
Licence : Droits gérés
Crédit : Science Photo Library / Biocosmos / Francis Leroy & Valerie Rouvroy
Model Release : Non requis
Durée : 30 Secondes
Aspect ratio : 16/9
Restrictions : -

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