Mitosis - PowerPoint PPT Presentation

1 / 23
About This Presentation
Title:

Mitosis

Description:

Mitosis Mitosis some basics form of nuclear division Therefore, only occurs in eukaryotic cells (prokaryotes perform binary fission ) Mitosis Occurs in ... – PowerPoint PPT presentation

Number of Views:117
Avg rating:3.0/5.0
Slides: 24
Provided by: dil103
Category:

less

Transcript and Presenter's Notes

Title: Mitosis


1
Mitosis
2
Mitosis some basics
  • form of nuclear division
  • ? Therefore, only occurs in eukaryotic cells
  • (prokaryotes perform binary fission)

3
Mitosis
  • Occurs in organisms for the purpose of
  • ?
  • ?
  • ?
  • ?

4
Mitosis
  • Goal

5
Hardest Concept!! Homolog Homolog
6
Cooler View!
7
Interphase
  • Not technically part of mitosis
  • Cell spends gt90 time in this phase
  • DNA exists in ___________ form
  • Cell performs..?
  • Most important Fact

8
Prophase
  • Events of Prophase

9
Prophase
  • Is the cell to the left a human cell?
  • How many chromosomes are pictured?
  • Are the chromosomes normal size or duplicated?
  • Which pieces of DNA are identical to each other?

10
Metaphase
  • The duplicated chromosomes line up along the
    equator of the cell.
  • What causes them to move?

11
Metaphase
  • How many chromosomes are pictured?
  • Are the two red Xs identical to each other?

12
Anaphase
  • Spindle fibers split the duplicated chromosomes
    in half.
  • The identical chromatids are separated from each
    other. But now they are normal sized
    chromosomes!
  • Will the two daughter cells be genetically
    identical?

13
Telophase
  • Telophase is called reverse prophase because..

14
Telophase
  • In telophase, cytokinesis occurs.
  • Cytokinesis -

15
Telophase
  • Q Are the two daughter cells genetically
    identical to each other????
  • Clones -

16
VI. Cytokinesis - division of the cytoplasm
A. In animal cells a contracting ring of
microfilaments tightens to form a
cleavage furrow
17
B. In plant cells a cell plate forms between
daughter cells
18
Quick-Check Identify the phase
19
IV. The Cell Cycle
20
Interphase (90 of the cell cycle) can be
subdivided into
1. G1 (Gap 1) is a time of growth
just after division.
2. S (Synthesis) is when the chromosomes
replicate.
3. G2 (Gap 2) is a period of additional growth
and preparation for division.
21
Thought Question
  • When do you think a stimulus which results in DNA
    replication would occur?

22
MITOSIS BIG IDEAS
  • Occurs in all eukaryotic organisms
  • Each chromosome is copied. (Can you describe
    how?)One copy of every chromosome is distributed
    to each of the two new daughter cells.
  • Thus ? All body (somatic) cells contain full set
    of chromosomes (therefore full set of genes)

23
Questions
  • When do cells mitose?
  • What determines when cells start and stop
    mitosing?
  • Can you think of a medical condition in which you
    would like human cells to mitosis, (but they
    normally dont)?
Write a Comment
User Comments (0)
About PowerShow.com