handout lecture Meiosis Chapter 10

handout lecture Meiosis Chapter 10 - 11/7/11


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Unformatted text preview: 11/7/11
 General
Biology
01:119:101‐Fall
2011
 Dr.
Monica
Torres
 Asexual
and
Sexual
Reproduction
 Outline
 Chapter 10. Meiosis, pp 225-236. 1.  Asexual and sexual reproduction. •  asexual
reproduction
 2.  Premeiotic interphase, Meiosis I: Prophase I (synapsis, crossing-over), Metaphase I, Anafase I, Telophase I, Interkinesis. 3.  Meiosis II: Prophase II, Metaphase II, Anaphase II, Telophase II •  sexual
reproduction
 4.  Comparison of mitosis and meiosis 1
 General
Biology
01:119:101‐Fall
2011
 Dr.
Monica
Torres
 General
Biology
01:119:101‐Fall
2011
 Dr.
Monica
Torres
 Diploid
(2n)
Cell
 Haploid
(n)
Cell
 unduplicated
chromosomes
 Duplicated
chromosomes
 MEIOSIS
 Sexual
Life
Cycle‐Fusion
of
Gametes
 Gametes
(n)
 PROPHASE
I
 Synapsis
of
homologous
 chromosomes
to
form
tetrads
 ANAPHASE
I
 Homologous
 chromosomes
move
to
 opposite
poles
 PROPHASE
II
 Two
n
cells
with
duplicated
 chromosomes
 Zygote
(2n)
 ANAPHASE
II
 Sister
chromatids
move
to
 opposite
poles
 HAPLOID
CELLS
 Four
n
cells
with
 unduplicated
 chromosomes
 Fig.
10‐16b,
p.
229
 1
 11/7/11
 MEIOSIS
I
 Stages
of
Meiosis
 1.
INTERPHASE






























 2.
PROPHASE
I
(
5
stages)
 Mid‐prophase
I
 •  MEIOSIS I 
 
 
 
 
 Late
prophase
I
 •  MEIOSIS II Prophase I 
Leptotene

 
Zygotene
(synapsis,
tetrads)
 
Pachytene
(crossing
over)
 
Diplotene

 
Diakinesis

 Metaphase I Anaphase I Telophase I Prophase II Metaphase II Anaphase II Telophase II Nucleolus
 Nuclear
envelope
 Homologous
 chromosomes
 Chromatin
 Centrioles
 Fig.
10‐13a
(1),
p.
226
 Stages
of
Prophase
I
 MEIOSIS
I
 Anaphase I Metaphase I Telophase I Microtubule attached to kinetochore Sister chromatids Cleavage furrow Separation of homologous chromosomes Fig. 10-15 Fig. 10-13b (1), p. 227 MEIOSIS
II
 MEIOSIS
II
 Prophase
II
 Metaphase
II
 Telophase II Anaphase
II
 Four cells (n) 25 µm Daughter
 chromosomes
 Fig.
10‐16a
(2),
p.
228
 Fig. 10-13b (2), p. 227 2
 11/7/11
 mitosis
 meiosis
 2n=4
 2n=4
 Gametes
(n)
 Meiosis
 Fertilization
 Zygote
(2n)
 2n=4
 2n=4
 Mitosis
 Mitosis
 Type
of
reproduction
 Meiosis
 asexual
 sexual
 Number
of
divisions
 1
 2
 Number
of
daughter
 cells
 2
diploid
cells
 4
haploid
cells
 n=2
 Multicellular
diploid

 organism

 (2n)
 Fig.
10‐16,
p.
229
 (a)
Animals
 Fig.
10‐19,
p.
232
 3
 ...
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