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Cellular Division - 7th Grade

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by

William Begoyan

on 1 December 2016

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Transcript of Cellular Division - 7th Grade

Cellular Division & The Cell Cycle
by Mr. Begoyan (page 27 in ISN).

Cytokinesis
Final stage of Cell Division
At the end, the original cell is fully divided into 2
daughter cells
Cell Cycle
Life of the cell, includes growth, development, and reproduction.
In The Nucleus
Mitosis

Interphase
Longest lasting phase of the Cell Cycle.
During this phase the cell will grow, replicate its DNA, and prepare for replication/division.
Interphase is broken down in to three parts, G1, S, and G2.
Cell grows bigger
DNA duplicates
Cell prepares for division
Every human has
23
unique chromosomes.
Chromosomes
are coiled, compact forms of DNA.
We have one pair of each chromosome, one from each parent called
homologous chromosomes.
Thus we have 46 chromosomes total.
Dad's
Mom's
Mitosis is the division of the nucleus, and occurs in 4 distinct stages.
Prophase, Metaphase, Anaphase, Telophase.
During the S phase, our chromosomes double, temporarily going from 46 to 92. These identical pairs are called
sister chromatids
.
What is the Cell Cycle?
What is Interphase?
What happens during Interphase?
What are the three parts of Interphase?
What happens in each part?
How many
unique
chromosomes
do humans have?
If humans have 23 unique chromosomes, why do we have a total of 46 in every cell?
What are homologues chromosomes?
What do we call the identical chromosome pairs that form during S phase?
During
Prophase
DNA condenses into chromosomes, and nuclear membrane disappears.
During
Metaphase
chromosomes align in the middle of the cell.
During
Anaphase
sister chromatids separate.
During
Telophase
the nuclear membrane reforms around each set of separated chromosomes.
What is Mitosis?
What happens during Prophase?
During which phase do the sister chromosomes align in the middle?
During which phase does the nuclear membrane reform?
What happens during Anaphase?
In animal cells a
Cleavage Furrow
forms and pinches the 2 new cells apart.
In plant cells, a
cell plate
forms between the 2 new cells.
Animal and plant cells go through different types of
Cytokinesis.
How is Cytokinesis different in plants and animals?
Whats happens in Cytokinesis?
What phase are we in?
What phase are we in?
What phase are we in?
AVID: Why do we need our cells to divide?
The end
Full transcript