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Summary

Samenvatting Schema: verloop van mitose en cytokinese in een dierlijke cel

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Dit schema toont het verloop aan van van mitose in een dierlijke cel. Hier vind je dus de profase, anafase, telofase, enz terug.

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Institution
Secondary school
Study
KSO
Course
School year
5

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Summarized whole book?
No
Which chapters are summarized?
Thema 2
Uploaded on
July 8, 2021
Number of pages
5
Written in
2020/2021
Type
Summary

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chromosoom met 2 zusterchromatide



centriolenpaar kinetochoren
op het centromeer




polaire microtubuli


evenaarsvlak

kinetochore microtubuli



nucleolus astrale microtubuli



samentrekbare ring


chromosoom



chromatinevezels
kernmembraan

, MEIOSE = 2 opeenvolgende celdelingen waardoor er uit één diploïde , 4 haploïde cellen ontstaaann.
● verhoopt in 4 fasen + cytokinese
● voorbereiding is identeiek de zelfde als bij de interfase mitose

Belang ● Productie van haploïde gameten
○ Meiose voorkomt een progressieve verdubbeling van het aantal chromosomen bij een bevruchting
● Productie van genetisch unieke gameten
○ Variatie in gameten
■ door recombinatie van DNA door crossing-over (tijdens profase 1)
■ door toevallige combinatie van chromosomen door mixing
● Mixing = tijdens anafase: toevallig migreren van maternale of paternale homologe
chromosomen naar één kant van de cel → genetisch unieke gameten




● Genetische variatie
○ voor in stand houden van de soort (bij gewijzigde leefomstandigheden)
○ Voorbeeld: organismen bestand tegen koude
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