What major events occur in interphase prophase metaphase anaphase and telophase draw diagrams to help explain your answer?
Interphase:
Three general phases occur - G1 (growth), S (synthesis), G2
(growth).
G1 is the time of very rapid growth and involves a high degree
of metabolic activity resulting in the synthesis of a RNA and a
large number of proteins --> This allows the increase in size
and number of cell organelles.
S involves the synthesis of nucelotides in the nucelolus and
replication of DNA, hence the name 'synthesis'. The original and
replicated strands of DNA remain connected at a point called the
centromere. And by now, each chromosome has become two
chromatids.
G2 involves cellular synthesis in preparation for cell division,
the cell continues to grow in this phase. Also, strands of protein
required to form spindle fibres will start to assemble.
After Interphase, Mitosis occurs.
In mitosis, there are 4 stages:
- Prophase, Metaphase, Anaphase and Telophase.
In prophase, basically the DNA threads are replicated, and the
chromosomes which consist of two strands (chromatids) are joined to
the centromere. Also, the protein threads form spindle fibre. The
nucleolus of the nuclear breaks down and the nuclear membrane
beings to separate.
In metaphase, the nuclear membrane disappears and the
chromosomes begin to migrate to the equation (align to the middle)
of the spindle. Each chromosome attaches to an INDIVIDUAL spindle
fibre.
In anaphase, the chromatids separate to opposite poles (sides)
of the spindle (it is said that this stage requires a large amount
of energy).
Telophase is when the microtubules disappear. The spindle breaks
down and a new nuclear membrane is formed around each bundle of
chromosomes.
Finally, after Mitosis has been performed, Cytokinesis (cell
division - final phase) occurs.
This involves forming a division through the middle of the
cytoplasm. New cell walls are then produced to make the separation
official. Now two daughter cells have been produced (they are
genetically identical to the original cell, hence why mitosis
occurs in asexual reproduction, growth and repair).
Hope I helped :)