cell cycle

• whats the two main staiges in cell cycle

  intrphase and mitosis
• what is the longer saige in cc

  intphase corresponding btw the end and the start of one divition to the next
• the interphase duration vries according to the nature and the phisiological condition of the cell
• what is the phases of interphase

  G1 S G2
• what happend in the G1 phase

  its the pre synthesise phase DNA duplication histon synthesis and centriole duplication
• what is G2 phase

  the premitotic phase
• what happend in G2 phase

  a number of factores are synthesised in particulare chromatin condensation factores
• what is mitosis 


  the division of a mather cell into 2 identical dauther celles and its the stage in which the chromosomes are clearly visibale
• what we call the division of the nucleus

  karyodiersis
• what do we call the divising of the cytoplasm

  cytodieresis
• what is the characteristecs the mitosisof


  chromosome spiralization a spindle of microtubules appears in the cytoplasm disppearance and the reconstitution of the nuclear envlope
• what is the core of mitotis

  prophase metaphse anaphase and telophase last btw 1nd 3 hours
• how long does the prophase take

  lasts 20 to 30 m
• what is the characteristics of the prophse

  the condensation of chromatin into chromosomes the centrosome initially composed of two centerioles as with the chromosom the centrosome is duplicated in the S phase into 4 centrosom the 4 centrosom separated during prophase each of which megrates to one of the cell the nucleolus diminishes in size and disappears the microtubule cytoskeleten reorganizes to form the mitotic spindle
• how long the metaphase least

  lasts 20 TO 30 M
• metaphase charasteristics

  a collection of all chromosomes on the equatorial plate their kinetochores at equal distance from the two poles maximum chromosome condition the metafasic chromosome so condenc and consists of two chromatids linked by a centromere
• anaphaseشجال تقعد ال

  5 to 8
• واش يميز الAnaphase

  centrosome clevage chromatine become independent shorting of the kenetocore mecrotubul and polare ascent of chromatide divide in two idantical set in each polare elogation of polar microtubules leading to cell elogation
• TELOPHASE last 20 m chromosomes stop migraing and fan out at the cell poll the chromatids bing to unwind

  reconstitution of the nuclear envlope and reappearance of the nucleolus