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What happens to the chromosomes in meiosis?

In meiosis, each chromosome lines up next to its homologous pair partner that it's already swapped a few genes with. Now the homologous pairs get pulled apart and migrate to either end of the cell. That's Anaphase I.

How many chromosomes are in a cell in telophase 2?

The chromosomes uncoil into chromatin, the crease-forming cleavage and the final separation of cytokinesis then mark the end of telophase II.#N#( 9:42) From one original cell with 46 chromosomes, we now have four new cells with 23 single chromosomes each. If these are sperm, all four of the resulting cells are the same size, but they each have slightly different genetic information. And half will be for making girls, and half will be for making boys.#N#( 9:58 )But if this is the egg-making process, then it goes a little bit differently here and the result is only one egg. To rewind a little, during telophase I, more of the inner goodness of a cell--the cytoplasm, the organelles--heads into ONE of the cells that gets split off than the other one. In telophase II, when it's time to split again, the same thing happens, with more stuff going into one of the cells than the other. This big ol' fat remaining cell becomes the egg, with more of the nutrients and cytoplasm and organelles that it will take to make a new embryo.#N#( 10:31) The other three cells that were produced, the little ones, are called polar bodies and they're totally useless in people, though they are useful in plants. In plants, those polar bodies actually also get fertilized too, and they become the endosperm. That's the starchy-proteiny stuff that we grind into wheat or pop into popcorn. And it's basically the nutrients that feed the plant embryo seed.

Is DNA replication involved in Prophase II?

But remember, the aim is to end up with four cells, so it's time for those sequel s. Here, the process is exactly the same as mitosis, except that the aim here isn't to duplicate the double chromosomes, but instead, to pull them apart, into separate single-strand chromosomes. Because of this, there's no DNA replication involved in Prophase II. Instead, the DNA just clumps up again into chromosomes, and the infrastructure for moving them--the microtubules--are put back in place.

What happens in the final phase of telophase?

The final phase of the first round, Telophase I, rolls out in pretty much the same way as mitosis. The nuclear membrane re-forms, the nucleoli form within them. The chromosomes fray out back into chromatin. A crease forms between the two new cells, called cleavage, and then the two new nuclei move apart from each other, the cells separate in a process called cytokinesis, literally again "cell movement". And that is the end of round one, we now have two haploid cells, each with 23 double chromosomes that are new, unique combinations of the original chromosome pairs. In these new cells, the chromosomes are still duplicated and still connected at the centromeres; they still look like X's.

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