There are 23 chromatid pairs in the somatic cells.
Mitosis
I). Mitosis
Mitosis is an orderly series of events that results in the equal distribution of the chromosomes that carry the genetic information to the two new cells
B). Mitosis involves:
1). The distribution of identical copies of the genetic information from the parent cell
2). cytokinesis
C). Mitosis is somatic cell division.
D). Mitosis is cyclic.
II). n and 2n
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There are 23 chromatid pairs in the somatic cells. |
(one from the father & one from the mother)
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23 pairs = 46 chromatids = 2n. This is called diploid |
Paired chromatids.
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23 individuals without partners = 1n (or n) |
This is called haploid.
Only the gametes are haploid.
Mitosis results in diploid daughter cells.
III). Structures of DNA
A). Chromatin:
B). Chromatid:
C). Chromosomes:
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IV). Stages of Mitosis
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A). Interphase
This is a non-dividing stage; the cell spends most of its time in this stage.
where:
i) cell growth (G1 phase),
ii). DNA replication (S phase), and
iii) .preparation for mitosis (G2 phase) occurs.
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B). Prophase
i). The DNA is duplicated
ii). The DNA is tightly coiled into chromosomes.
C). Metaphase
i). the lining up of the chromosomes along the midline.
ii). The centrioles line up at opposite poles and
the spindles begin to attach to the centromeres of the chromosomes
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D). Anaphase
the separation of sister chromosomes and their movement to the opposite poles of the spindles.
E). Telophase
i). The chromosomes reach the opposite poles and
ii). The sides of the cell form a furrow and cytokinesis occurs.
Prophase: Chromosomes and spindles are Produced---Procede or begin mitosis
Metaphase: chromosomes MetAlign themselves--- in the Middle
Anaphase: [Ana] divorced or separated--------And away we go
Telophase: Tell-O'Brien his daughter cells are ready----The end
