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Question 1

What happens during Anaphase?

Meiosis I & II & Mitosis

Answer 1

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

Meiosis I: - homologous chromosoners are pulled apart.

Question 2

Phases of Mitosis

Answer 2

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

Question 3

What happens during Prophase?

Meiosis I & II & Mitosis

Answer 3

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)

Question 4

What happens during Metaphase?

Meiosis I & II & Mitosis

Answer 4

In all:

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

Question 5

What happens during Interphase?

Answer 5

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

Question 6

Define chromatin

Answer 6

the unwound state of DNA during interphase

Question 7

Define:

centrosome vs. centromere vs. centriole

Answer 7

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

centromere = connects 2 sister chromosomes.

Question 8

Define kinetochore

Answer 8

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

Question 9

Define tetrad

Answer 9

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

Question 10

What happens during teleophase

Meiosis I & II & Mitosis

Answer 10

In all:

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