Oocyt

En oocyt, oöcyt, ovocyt, eller sjældent ocyt, er en kvindelig gametocyt eller kønscelle involveret i reproduktion. Den er en umoden ægcelle. En oocyt produceres i æggestokken under kvindelig gametogenese. De kvindelige kønsceller producerer en oprindelig kønscelle (primordial germ cell eller PGC), som derefter undergår mitose, og danner oogonium. Under oogenese bliver the oogonia primære oocytter.

Dannelse

Diagram, der viser reduktionen i kromosomantal under processen med modning af ægget; processen kendes som meiose.
Uddybende Uddybende artikel: Oogenese

Dannelsen af en oocyt kaldes oocytogenese, hvilket er en del af oogenese.[1] Oogenese resulterer i dannelsen af både primære oocytter i løbet af den føtale periode og sekundære oocytter derefter som en del af ægløsning.

Celletype ploidi/kromosomer kromatider Proces Fuldførelsestid
Oogonium diploid/46(2N) 2C Oocytogenese (mitose) tredje trimester
primær oocyt diploid/46(2N) 4C Ootidogenese (meiose I) (follikulogenese) Dictyotén i profase I i op til 50 år
sekundær oocyt haploid/23(1N) 2C Ootidogenese (meiose II) Stoppes i metafase II indtil befrugtning
Ootid haploid/23(1N) 1C Ootidogenese (meiose II) Minutter efter befrugtning
Ovum haploid/23(1N) 1C

Fodnoter

  1. ^ answers.com

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