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Summary Seldeling

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Ongelooflike opsomings wat al die werk in 'n meer sinvolle manier weerspieel. Die werk is so weerspieel dat mens beter verstaan wat sal lei tot die vermindering van tyd wat bestee moet word aan leer. Die opsommings is 'n moet he vir biologie graad 10.

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  • Unknown
  • February 9, 2019
  • 6
  • 2018/2019
  • Summary
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u18076140
BIOLOGY VasPenNotas:
Onderwerp
3
SELDELING: MITOSE
DIE GROEI EN VERDELING VAN ‘N SEL

 Eensellige organismes plant ongeslagtelik voort deur mitotese seldeling
 Veelsellige organismes gebruik mitotse vir groei, herstel en vervanging van dooie
selle.

Seldeling: beheer selgroote en die verhouding tussen die oppervlakte en volume.

Die Selsiklus


Interfase Mitose
Selgroei Seldeling



Sel voer sy funksies uit DNA repliseer om 2 stelle te
en word groter lewer in die kern
= chromosome sigbaar



Twee chromatede (stelle oorerflike materiaal) verbind deur ‘n sentromeer

Verhouding van oppervlakte tot volume

Verhouding tussen ‘n sel se volume en oppervlakte vir die uitruil van
voedingstowwe en afvalstowwe = beheer deur die kern.

 Verhouding te klein (ssel te groot): verdeel die sel om
verhouding te herstel

∴ ‘n groep klein selle het ‘n baie groter oppervlakte van
selmembraan in verhouding tot die volume van die sitoplasma




1
Gr 10

, BIOLOGY VasPenNotas:
Onderwerp
3



MITOSE

Proses van seldeling waar ‘n volwasse sel verdeel in 2 identese nuwe
sell


Kariokinese = verdeling van die kern

Verdelingsproses
Sitokinese = verdeling van die sitoplasma



Doel van mitose ???


GROEI HERSTEL VOORTPLANTING
Veelsellige organismis benodig Herstel en vernuwe Eeensellige organismes plant
seldeling om van enkelsel na gedurig om verweerde deur binêre splitsing en
verskei selle of dooie selle te vervang okulering voort bv bakterieë


Waar vind mitose plaas ??

Plante
 Apikale meristeemweefsels agter die punt van die wortel of stngel en in knoppe
 Laterale meristeemweefsels onder die bas

Diere
Mitose vind op spesifeke plekke in die organe plaas bv.
 Beenmurg
 Basale lae van die vel




2
Gr 10

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