Spermatogenesis sequence

Videonummer 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.
Lizenzart: Lizenzpflichtig
Credit: Science Photo Library / Biocosmos / Francis Leroy & Valerie Rouvroy
Modell-Rechte: nicht erforderlich
Länge: 30 Sekunden
Seitenverhältnis: 16:9
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