These events of meiosis are not in order…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
These events of meiosis are not in order.
- The sister chromatids separate and move to opposite poles.
- The homologues pair and exchange pieces.
- The bivalents lie on the equator.
- Four haploid cells are formed.
- The homologous chromosomes separate, and the sister chromatids stay together.
- Two cells are formed, and the DNA is not copied again.
- Write the events in the right order.
- Which event is the reduction of the chromosome number?
Need a reminder? The key ideaShow
Meiosis I separates the homologues, and each cell gets half the chromosomes, each of two chromatids. Meiosis II separates the sister chromatids. The DNA of a human cell goes C, C, C and C. A cell in anaphase II has the diploid number of chromosomes, but only C of DNA.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) The order is .
- Prophase I: the homologues pair and exchange pieces (2).
- Metaphase I: the bivalents lie on the equator (3).
- Anaphase I: the homologues separate (5).
- Telophase I and interkinesis: two cells, no new copying (6).
- Anaphase II: the sister chromatids separate (1).
- Telophase II: four haploid cells (4).
Step 2. (b) Event 5, the separation of the homologues in anaphase I.
Answer: 2, 3, 5, 6, 1, 4; the reduction is event 5.
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