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Prophase I
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Chromatin become Chromosomes, Nuclear membrane fades, nucleus and nucleolus disappears, synapsis occurs, tetrads appear, sister chromosomes are present and crossing over takes place
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Snyapsis
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Each pair of homologous chromosomes move together in prophase I of meiosis
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What is a tetrad made up of/ equal to?
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2 dyads; 1 homologous pair of chromosomes; or 4 chromatids.
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What happens in Metaphase 1 of Meiosis?
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Homologous pairs of chromosomes line up at the equator
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When does crossing over take place?
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In Prophase 1 of Meiosis
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What happens in Anaphase 1 of Meiosis?
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Tetrads (dyads seperate, one goes south, the other dyad north) of each pair separate but the centromere stays connected.
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What happens in Telophase 1 of meiosis?
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Nuclear envelope reforms, nucleoli reappear and cells separate but there is no replication of DNA although the chromosomes are replicated.
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What happens in prophase 2 of meiosis
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Nuclear membrane fades, nucleus and nucleolus disappears, synapsis
occurs, no tetrads just replicated chromosomes.
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What happens in metaphase 2?
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Replicated chromosomes in the two sister cells line up at the equator.
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What happens in ananphase 2?
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Chromatids separate from chromatids and the centomeres break apart and go to their respective poles.
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What happens in telophase 2?
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Four haploid daughter cells are created each containing on set (1n) of non replicated chromosomes.
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What does mitosis do?
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Only replicates somatic cells, what number of chromosomes you start with you end with. the cell starts diploid ends diploid.
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Haploid
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1 set or 1(n) refers to chromosomes. sex cells are haploid.
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What chromosomes determines sex?
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The 23rd. xx girl xy male,
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What happens in the G1 interphase of the cell cycle?
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It is a period of cell growth before the DNA is duplicated. proteins are being produced and the chromosomes are not replicated yet.
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