Sexual Reproduction. Three kinds of eukaryotic cell reproduction.
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Transcript of Sexual Reproduction. Three kinds of eukaryotic cell reproduction.
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Sexual Reproduction
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Three kinds of eukaryotic cell reproduction
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Eukaryotic Life Cycles
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Mitosis
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Meiosis
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Meiosis
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Spindle Connections inCell Divisions
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Overview of Meiosis
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Independent AssortmentRecombination of genes located on different chromosomes
1/2 time1/2 time
A
AB
B
b
b
b
b
B
Ba
a
ABAb
aB ab
A
A
a
a
b
b
B
B
Anaphase I
Non-homologous pairs of chromosomes orient independently of one another on the metaphase plate of the spindle
Below, the relative movement of the A and B chromosomes is illustrated:
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Crossing-OverRecombination of genes located on the same chromosomes
nucleus
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Meiosis I Bivalent
2 paired homologues(4 chromatids)
5 cross-overs
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Synaptonemal Complex
LELELELE CECE
R NR N DyadDyadDyadDyad
2 Dyads
chiasmata
chromatid
synapsing bivalent
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Synaptonemal Complex Time Course
Synaptonemal Complex
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Homologous Recombination
strand invasion ensures homologous nicks
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Eukaryotic Life Cycle
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Syngamy(Fertilization)
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Syngamy
Sperm Sperm and Egg
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Sperm, Egg, and Zygote
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Why did sex evolve?
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Review of Genetic Changes
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Summary - Questions
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Summary - Answers
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Haploid Mitosis
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Diploid Mitosis
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Mitoses
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Meiosis
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Syngamy
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Practice
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Practice - Questions
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Practice - Answers