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1
Q

What happens during Anaphase?

Meiosis I & II & Mitosis

A

Meiosis II & Mitosis: - sister chromatids are pulled apart.

Meiosis I: - homologous chromosoners are pulled apart.

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2
Q

Phases of Mitosis

A
  1. Prophase
  2. Metaphase
  3. Anaphase
  4. Telophase
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3
Q

What happens during Prophase?

Meiosis I & II & Mitosis

A

In all:

  • Nuclear envelope begins to disintegrate
  • Chromosomes condense
  • Centrosomes begin to migrate to opposite ends.

In Meiosis I only:
-Crossing over begins between homolog. chrom. (in tetrads)

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4
Q

What happens during Metaphase?

Meiosis I & II & Mitosis

A

In all:

  • Nuclear envelope completely disappears
  • Chromosomes line up
  • Microtubules from centrosomes connect to each other as well as to the centromeres.
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5
Q

What happens during Interphase?

A
  1. G1 phase = growth
  2. S phase = synthesis
    - All genetic material dup;licates (BUT NOT in Interphase II)
    - Centrome also duplicates
  3. G2 phase = growth
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6
Q

Define chromatin

A

the unwound state of DNA during interphase

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7
Q

Define:

centrosome vs. centromere vs. centriole

A

centrosome = organelle containing centrioles, near the nucleus; from it, the spindle fibers develop.

centromere = connects 2 sister chromosomes.

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8
Q

Define kinetochore

A

a protein structure on chromatids that assembles on the centromere, linking the chromosomes to the mocrotubules.

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9
Q

Define tetrad

A

Group of 2 homologous chromosomes that assemble together in Meiosis I - will have crossing-over.

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10
Q

What happens during teleophase

Meiosis I & II & Mitosis

A

In all:

  • Starting to reverse what was done in prophase
  • DNA begins to unwind
  • Nuclear Envelope begins to form.
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