this slide helps you to study the cell cycle mitosis and meosis in detail.

2. Group #5
Group Members
Nimra khan (L)
Kashmala
Laiba
Iqra
Shiasta
Taqdees

3. Cell CYCLE
.
Cell cycle is a series of
events that take place
in a cell leading to
duplication of its
DNA and division of
cytoplasm to produce
two daughter cells.

4. Phases of Cell Cycle
Cell Cycle consists of two phases:
 Interphase
 Mitotic phase
Interphase:
It is a period of great biochemical activity
and is divided into three phases:
 G1 phase
 S phase
 G2 Phase

5. INTERPHASE :
G1 PHASE
 Cell metabolically active and
grows continuously
S PHASE:
 DNA synthesis occurs
 Chromosome number is
doubled
G2 PHASE:
 Energy is stored for
chromosome movement
 Mitosis specific proteins are
synthesized

6. MITOTIC PHASE:
 “Mitosis is a type of cell division that ensures same
number of chromosomes in daughter cells as that of
parent cells”
 It consists of following phases:
 Prophase
 Metaphase
 Anaphase
 Telophase

7. PROPHASE :
• Chromatin material
condenses
• Chromosomes
becomes visible
• Nuclear envelope
disappears
• Nuclear material is
released in cytoplasm
• Nucleoli disappears

8. METAPHASE:
• The kinetochore fibers of
spindle attach to kinetochore
region of chromosomes
• Chromosomes line up at the
equator of spindle forming
equatorial plate or metaphase
plate

9. ANAPHASE :
• Critical phase of mitosis
• Kinetochore fibers contract
towards their respective
poles
• Chromatids separate and
move to opposite poles

10. TELOPHASE:
• Chromosomes decondense due
to unfolding
• Chromosomes disappears as
chromatin
• Mitotic apparatus disorganizes
• Nuclear mebrane and nucleoli
reorganizes
• Resuts in formation of two nuclei
at two poles of the cell

11. CYTOKINESIS:
“Cytokinesis is division of protoplast of cell
into two daughter cells”
 Astral Microtubules send signals to equatorial
region of cell
 Contractile ring is formed
 Clevage furrow deepens towards center of cell
 Cell is divided into two daughter cells

13. Importance of Mitosis:

15. MEIOSIS
 A kind of cell division in which number of
chromosomes in daughter cells is reduced to
half as compared to parent cell.
 It consists of following phases:
 Prophase I and II
 Metaphase I and II
 Anaphase I and II
 Telophase I and II

27. MEIOSIS II:
 Phases of meiosis II are similar to phases of
mitosis
 In meiosis II two daughter cells are formed
 Cytokinesis takes place and four haploid cells
with half number of chromosomes are
formed

42. Symptoms:
Female appearance
Short strature
Webbed neck
Without ovaries
Complete absence
of germ cells