PERFORMANCE TASK #2
Storyboard Text
- Hey Rose, do you know about the meiosis or sex cell division?
- Okay! But for now, let me tell you about the meiosis.
- Not all, but i have some knowledge about meiosis.
- Okay, if you say so.
- Meiosis has 2 divisions, 4 daughter cells, 23 chromosomes.
- Yes, that's right.
- Is that in gametes {sex cells} for sexual reproduction?
- Meiosis is a nuclear division in which the diploid or somatic number of chromosomes is reduced in half.
- In metaphase I, the tetrads attached to spindle fibers at their centromeres, line up at mid-call.
- In prophase I, a process that is called synapsis that is fusing together of each pair of homologous chromosomes.
- In anaphase I, each centromere moves toward its respective pole without duplicating.
- There are now two cells, each with the same number of chromatids as the parent cell.
- In telophase I, produces two cells, each of which has just one member of each homologous pair chromosomes that was present in the original cell.
- Prophase II begins. In the second meiotic division, homologous chromatids do not duplicate but merely separate.
- The chromatids line up at mid-cell in metaphase II. The centrioles and asters are at the poles. A spindle has formed. Am I right?
- Did you get it, Rose?
- Yes, you're right.
- Yes.
- And telophase II has been completed. There are four cells, each with half the number of chromosomes of the parent cell.
- The now separated chromatids approach their respective poles in anaphase II. The cell membrane starts to constrict.
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