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152 I 2 Meiosis Essay

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Message of the day
Quizzes start this week… use the GLC often!

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Where are we?

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Where are we?

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Mitosis/Meiosis

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1. Mitosis: sister chromatids in metaphase
2. Life cycles: Alternation of generations, haplontic, diplontic 3. Meiosis
– Terms to own
– The process of meiosis
• Homologous chromosomes, metaphase I & II
• Sources of variation in meiosis

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Mitosis

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1 round of DNA replication, 1 round of nuclear
division

Mitosis
• Key to understanding mitosis is to own
metaphase: sister chromatids line up

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More terms

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- Chromosome: condensed chromatin
- Chromatids: replicated chromosomes held
together by protein complex called cohesions,
and by the centromere
- Centromeres:

More terms

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- Chromosome: condensed chromatin
- Chromatids: replicated chromosomes held
together by protein complex called cohesions
and by the centromere
- Centromeres are made up of proteins that
bind to DNA
- Kinetochore: region of centromere where
spindle attaches

Kinetochore

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- Region of centromere where spindle attaches

Centrosome
- Centrosome (animal) ~ MTOC (microtubule
organizing center) = base of microtubule
spindles in mitosis

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Metaphase

http://mitosis.wikidot.com/lzimmermann­phases­of­mitosis

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The Phases of Animal Mitosis

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Cell cycle

Cell Division 16

The Phases of Animal Mitosis

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The Phases of Animal Mitosis

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The Phases of Animal Mitosis

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Mitosis in animals: key steps

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• DNA replicates generating sister chromatids
• Chromosomes appear, centrosomes move to
opposite poles
• Chromosomes line up in metaphase and bi...

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Keywords

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