HUMA 205 Lecture Notes - Lecture 7: Solenoid, Cytokinesis, Centromere
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3. Cytokinesis:
Cytoplasm divided between two daughter cells
Chromosome
Structure:
Made up of
chroma=n: DNA
40% + protein 60%
46 chromosomes in our cells
DNA gets wound around Histone Proteins
Histone proteins then wound up in structure of non – dividing
chroma=n called the Solenoid
Before DNA divides it is condensed into like an X shape form:
this allows DNA to be separated into two di;erent nuclei
without ge5ng tangled
Condensed chroma=n when referring to cell replica=on
23 pairs of chromosomes – one from mother and father for
each pair
They bind in terms of size
Homologous Chromosomes vs Sister Chroma+ds
Homologous: they are same so therefore match up
Centromere: important for when cells divides
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