*can observe the chromosome movement: differential contrast light microsopy
+G1: growing making extra contents for daughter cells
[Cell cycles in multicellular organisms]
1.Many mature cells do not divide:
–E.g. nerve cells, muscle cells, RBC
–As they became specialised they lost the ability to divide.
2.Some cells only divide when given an appropriate stimulus:
–E.g. liver cells
–When part of the liver is surgically removed the remaining liver cells start to divide to
replace the lost tissue.
3.Some cells normally divide on an ongoing basis:
–E.g. Hematopoietic and epithelial stem cells Which of the following options represents the appropriate order the cell cycle phases
A.G1, S, G2.
B.G0, G1, S, G2.
C.Cytokinesis, G1, S, G2.
D.Cytokinesis, S, G1, G2. [prophase]
*replicated chromosomes condense:
-by activity of protein complex
*mitotic spindle assembly
-starts but not finished yet
•At the end of G2 the replicated chromosomes are dispersed and tangled
•At the beginning of mitosis chromosomes condense
•The sister chromatids are resolved but remain associated [Centrosome structure]
The centrosome MTOC:
A pair of centrioles:
–Organised at right angles to eac