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meiosis. G2 interphase. Nuclear envelope present Nucleoli visible 2 centrosomes (in animal cells these contain the centrioles ) Chromosomes are long, thin, and invisible under the light microscope. Prophase I. Chromosomes condense Synapsis occurs (pairing of homologous chromosomes)

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g2 interphase
G2 interphase

Nuclear envelope present

Nucleoli visible

2 centrosomes (in animal cells these contain the centrioles)

Chromosomes are long, thin, and invisible under the light microscope

prophase i
Prophase I

Chromosomes condense

Synapsis occurs (pairing of homologous chromosomes)

Tetrads form (4 chromatids)

Crossing over occurs at chiasma

Centrosomes move apart

Spindle forms

Nuclear envelope and nucleolus disappear

Spindle attaches to kinetochore

metaphase i and anaphase i
Metaphase I and anaphase I

Homologous chromosomes line up in pairs along the metaphase plate

Kinetochore microtubules are attached to each pair

Homologous chromosomes are pulled toward opposite poles

Chomosomes are still made of sister chromatids

Cell elongates

telophase i and cytokinesis
Telophase I and cytokinesis

Each pole has a haploid set of chromosomes

Cleavage furrow/cell plate forms

Nuclear envelope and nucleolus may reform

There may be a resting phase called interkinesis

NO doubling of chromosomes happens

prophase ii
Prophase II

Spindle forms

Chromosomes condense

Nuclear envelope and nucleolus disappears

Centrosomes move apart

metaphase ii and anaphase ii
Metaphase ii and anaphase ii

Chromosomes line up SINGLE FILE along the metaphase plate

Kinetochore microtubules are attached to sister chromatids

Centrosomes split

Chromatids are pulled to opposite poles by kinetochore microtubules

Cell elongates

telophase ii and cytokinesis
Telophase ii and cytokinesis

Nuclei reform at opposite poles

Cytokinesis occurs

4 daughter nuclei have formed each with one half the original number of chromosomes as the parent cell

Each gamete formed is unique