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What must happen before meiosis can begin?

Does meiosis begin with 46 or 92 chromosomes in humans?

  • "Meiosis is a two-part cell division process in organisms that sexually reproduce, which results in gametes with one half the number of chromosomes of the parent cell." I ...show more

  • Answer:

    Before meiosis - 46 chromosomes (no human cells ever have 92). After meiosis I - 23 chromosomes that are still double-stranded. They doubled their DNA before meiosis started, and during meiosis I each double-stranded chromosome got away from its homologous partner. After meiosis II - four cells, each with 23 single-stranded chromosomes. During meiosis II the double-stranded chromosomes split at their centromeres and the sister chromatids are pulled apart from each other. So it isn't 4 x 23. 46 double stranded chromosomes --> 23 double-stranded chromosomes per cell after meiosis I --> 23 single-stranded chromosomes per cell after meiosis II.

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we're looking the cells individually, as they are separate cells. so we look at it and say that there are 23 chromosomes each. with your way of thinking in our bodies we have 46 x 381927837129836281368912 x 10^9 number of chromosomes and although that's true (the exaggeration i mean) we only care how many there are in each cell. by the end of meiosis I, each daughter cell is haploid. those daughter cells then divide into 4 and still remain haploid.

We don't have 92 different chromosomes. 92 is 4 copies of the same 23 chromosomes. the 23 chromosomes are the half of the 46 total chromosomes of an individual that are passed on to the gamete (sperm or egg) and then to the baby if the gamete unites with another gamete. Since each gamete has 23 chromosomes, the new baby now has 46 chromosomes, a complete human. 23 from each parent.

somebody

46 chromosomes my child.

D@ni DiC@prio

46

Beast from the East

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