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Résumé Psychologie du développement tout au long de la vie
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-PSYCHOLOGIEChapitre 2 : La période prénatale
Développement physique : La conception
● Le développement humain commence toujours la réunion d’un gamète mâle
(=spermatozoïde) et d’un gamète femelle (=ovule) pour former une seule cellule, appelée
le zygote
● Chaque gamète contient la moitié du plan génétique d’un individu, à savoir 23
chromosomes. Hors accident, le plan génétique de chaque individu contient 46
chromosomes.
● Le plan génétique va régir complètement le développement de l’individu : voix, forme du
visage, maladies, capacités intellectuelles...
La période germinale
● La période germinale correspond aux deux premières semaines de grossesse
● Au cours de cette période, le zygote descend dans la trompe de Fallope, vers l’utérus où
s’opère le processus de mitose
● Au bout de quelques jours, la différenciation entre l’embryon et l’enveloppe placentaire
s’opère
● Au bout de deux semaines, la nidation/ l’implantation dans la muqueuse utérine/ prend n
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