meiosis. figure 13.2 (a) hydra (b) redwoods bud parent 0.5 mm
TRANSCRIPT
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Meiosis
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Figure 13.2
(a) Hydra (b) Redwoods
Bud
Parent
0.5 mm
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Figure 12.7a
G2 of Interphase Prophase Prometaphase
Centrosomes(with centriole pairs)
Chromatin(duplicated)
NucleolusNuclearenvelope
Plasmamembrane
Early mitoticspindle
Aster
Centromere
Chromosome, consistingof two sister chromatids
Fragments of nuclearenvelope
Nonkinetochoremicrotubules
Kinetochore Kinetochoremicrotubule
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Figure 12.7b
Metaphase
Metaphase plate
Anaphase Telophase and Cytokinesis
Spindle Centrosome atone spindle pole
Daughterchromosomes
Cleavagefurrow
Nucleolusforming
Nuclearenvelopeforming
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Figure 13.3a
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Figure 13.3b
Pair of homologousduplicated chromosomes
Centromere
Sisterchromatids
Metaphasechromosome
5 m
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Figure 13.3c
5 m
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Figure 13.4
Sister chromatidsof one duplicatedchromosome
Key
Maternal set ofchromosomes (n 3)Paternal set ofchromosomes (n 3)
Key
2n 6
Centromere
Two nonsisterchromatids ina homologous pair
Pair of homologouschromosomes (one from each set)
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Figure 13.6aKey
Haploid (n)Diploid (2n)
Gametes
MEIOSIS FERTILIZATION
Zygote
MitosisDiploidmulticellularorganism
(a) Animals
n
2n
n
n
2n
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Figure 13.6b
2n2n
n
MEIOSIS FERTILIZATION
Mitosis Mitosis
Mitosis
GametesSpores
Zygote
Haploid multi-cellular organism(gametophyte)
Diploidmulticellularorganism(sporophyte)
(b) Plants and some algae
n n n n
Haploid (n)Diploid (2n)
Key
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Figure 13.6cKey
Haploid (n)Diploid (2n)
2n
n n
n
n
n
MEIOSIS FERTILIZATION
Mitosis Mitosis
Gametes
Zygote
Haploid unicellular ormulticellular organism
(c) Most fungi and some protists
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Figure 13.6
KeyHaploid (n)
Diploid (2n)
Gametes
MEIOSIS FERTILIZATION
Zygote
MitosisDiploidmulticellularorganism
(a) Animals
n
n
n
2n 2n 2n2n
2n
n n
n
n n
nn
n
n
nMEIOSIS
MEIOSIS
FERTILIZATION
FERTILIZATION
Mitosis Mitosis
Mitosis
Mitosis Mitosis
GametesSpores
Gametes
Zygote
Zygote
Haploid multi-cellular organism(gametophyte)
Diploidmulticellularorganism(sporophyte)
Haploid unicellular ormulticellular organism
(b) Plants and some algae (c) Most fungi and some protists
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Figure 13.7-3
Pair of homologouschromosomes indiploid parent cell
Duplicated pairof homologouschromosomes
Chromosomesduplicate
Sisterchromatids Diploid cell with
duplicatedchromosomes
Homologouschromosomes separate
Haploid cells withduplicated chromosomes
Sister chromatidsseparate
Haploid cells with unduplicated chromosomes
Interphase
Meiosis I
Meiosis II
2
1
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Figure 13.8a
Prophase I Metaphase I Anaphase I Telophase I andCytokinesis
Centrosome(with centriole pair)
Sisterchromatids
Chiasmata
Spindle
Homologouschromosomes
Fragmentsof nuclearenvelope
Duplicated homologouschromosomes (red and blue)pair and exchange segments;2n 6 in this example.
Centromere(with kinetochore)
Metaphaseplate
Microtubuleattached tokinetochore
Chromosomes line upby homologous pairs.
Sister chromatidsremain attached
Homologouschromosomesseparate
Each pair of homologous chromosomes separates.
Cleavagefurrow
Two haploid cells form; each chromosomestill consists of two sister chromatids.
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Figure 13.8b
Prophase II Metaphase II Anaphase II Telophase II andCytokinesis
Sister chromatidsseparate
Haploid daughtercells forming
During another round of cell division, the sister chromatids finally separate;four haploid daughter cells result, containing unduplicated chromosomes.
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Human gametogenesisSpermatogenesis Oogenesis
Primaryspermatocyte
Primaryoocyte
Secondaryspermatocytes
Secondaryoocyte
Polar body
Spermatids
Sperm
Polar body
Fertilized egg
2n 2n
n
n
n
n
n n
n n n n
n n n n
Figure 46.UN01
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Figure 13.9a
Prophase
Duplicatedchromosome
MITOSIS
Chromosomeduplication
Parent cell
2n 6
Metaphase
AnaphaseTelophase
2n 2n
Daughter cellsof mitosis
MEIOSIS
MEIOSIS I
MEIOSIS II
Prophase I
Metaphase I
Anaphase ITelophase I
Haploidn 3
Chiasma
Chromosomeduplication Homologous
chromosome pair
Daughter cells of
meiosis I
Daughter cells of meiosis II
n n n n
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Figure 13.9b
SUMMARY
Property Mitosis Meiosis
DNAreplication
Number ofdivisions
Synapsis ofhomologouschromosomes
Number of daughter cellsand geneticcomposition
Role in the animal body
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Figure 13.10-1
Possibility 1 Possibility 2
Two equally probablearrangements ofchromosomes at
metaphase I
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Figure 13.10-2
Possibility 1 Possibility 2
Two equally probablearrangements ofchromosomes at
metaphase I
Metaphase II
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Figure 13.10-3
Possibility 1 Possibility 2
Two equally probablearrangements ofchromosomes at
metaphase I
Metaphase II
Daughtercells
Combination 1 Combination 2 Combination 3 Combination 4
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Figure 13.11-1Prophase Iof meiosis
Nonsister chromatidsheld togetherduring synapsis
Pair of homologs
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Figure 13.11-2Prophase Iof meiosis
Nonsister chromatidsheld togetherduring synapsis
Pair of homologs
Chiasma
Centromere
TEM
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Figure 13.11-3Prophase Iof meiosis
Nonsister chromatidsheld togetherduring synapsis
Pair of homologs
Chiasma
Centromere
TEM
Anaphase I
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Figure 13.11-4Prophase Iof meiosis
Nonsister chromatidsheld togetherduring synapsis
Pair of homologs
Chiasma
Centromere
TEM
Anaphase I
Anaphase II
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Figure 13.11-5Prophase Iof meiosis
Nonsister chromatidsheld togetherduring synapsis
Pair of homologs
Chiasma
Centromere
TEM
Anaphase I
Anaphase II
Daughtercells
Recombinant chromosomes