Question

What are the number of (human) chromosomes in each stage of Meiosis?

Answer 1

$\huge\bold{Answer:}$

Well meiosis in humans is basically a division process that takes us from a diploid cell i.e., one with two sets of chromosomes to haploid cells which is ones with a single set of chromosomes.

Furthermore, the haploid cells made in meiosis are sperm and eggs in humans.

$\large\bold{Phases:}$

Well meiosis is a lot like mitosis in a number of ways i.e., the cell goes through similar stages and uses similar strategies to organize and separate chromosomes. However, in meiosis, the cell has a more complex task.

[But it still needs to separate sister chromatids (the two halves of a duplicated chromosome), as in mitosis. But it must also separate homologous chromosomes, the similar but nonidentical chromosome pairs an organism receives from its two parents.]

Coming to the point, Homologue pairs well gets separated during a first round of cell division, called "meiosis I". Sister chromatids separate during a second round which is called as "meiosis II".

So we see that there are two phases of meiosis namely known as meiosis I and meiosis II.

$\large\bold{Choromsomes\:in\:each\:meiosis:}$

$\large\underline{Meiosis\:I}$

Meiosis I begins with a diploid (2n = 4) cell and ends with two haploid (n = 2) cells.) In humans (2n = 46), who have 23 pairs of chromosomes, the number of chromosomes is reduced by half at the end of meiosis I and that is (n = 23).

$\large\underline{Meiosis\:II}$

So here, the number of chromosomes well remains unchanged from the beginning till the end of meiosis II which is (n = 23). Spindle fibers reform and attach to centromeres in the prophase II.