7. 7
The functions of cell division
(a) Amoeba : reproduction
(b) Multicellular organisms: growth and
development
(c) Mature multicellular organisms: renewal
and repair of tissues
(a)
(c)
(b)
23. 23
Meiosis
• Interphase
• Prophase I
• Metaphase I
• Anaphase I
• telophase I
• Interphase II
• Prophase II
• Metaphase II
• Anaphase II
• telophase II
106. 106
Sperm Enter Egg
1stand 2nd polar bodies
male pronucleus
(n) female pronucleus
(n)
male pronucleus
replicating its DNA
female pronucleus
replicating its DNA
Beginning of
first division
Fusion of nuclei from
egg and sperm
a.
b.
c.
d.
118. 118
Development of multicellular organisms
• Fertilization
• Embryonic development
• Larval development (metamorphosis)
• Maturation of individual (gametogenesis)
• Aging
• Death