What happens to chromosomes before mitosis?

Answer 1

Before mitosis happens, there is an S phase and 2 G phases also known as the interphase.

First, its the G1 phase or gap 1, basically it is the longest phase among the whole cell division. The cell grows in size and manufacture all the important stuffs such as organelles. When the time is "ripe", a molecular signal will be passed and the cell enters the S phase.

During the S phase or synthesis phase, your choromsomes begin to divide in the nucleus. DNA replication happens and the system would ensure that only a SINGLE copy would be replicated. After synthesis of DNA, a signal will come in to allow the cell to enter the G2 phase.

During the G2 phase or the 2nd gap phase, the cells continue to grow and produces more molecules essential for mitosis.

After G2 phase, the cell enters the mitosis phase.

Answer 2

Mitosis and meiosis happen in diverse factors of the physique, particularly than one after the different. Mitosis happens in all physique tissues, apart from the production of eggs and sperm (germ cells). Its function is to change cells that have reached the tip of their lives and characteristic been killed off through the physique. some cells e.g. in the liver turn over without put off, others e.g. in the frightened gadget turn over slowly. each chromosome in a human happens as 2 copies, one inherited from each discern. Mitosis: each chromosome copies itself, so there are 2 copies, then the two copies separate and pass to the poles of the cellular. New membranes type and a pair of recent daughter cells (it is in basic terms what they are called) are formed, each comparable to the discern that gave upward thrust to them. Chromatids are comparable to chromosomes, they are in basic terms supply a various call during nuclear (cellular) branch. Meiosis, the branch technique that produces germ cells. each chromosome copies itself, so there are 2 chromatids (the specific call given to chromosomes during branch). each pair of chromatids then binds to its pair, so as that there is a kit deal of four chromatids. the significant element relating to the 4 chromatid kit deal is they replace products of DNA with one yet another till now isolating - it particularly is how new combos of genetic variety are created and why anybody are diverse and it particularly is termed recombination. After recombination there are 2 divisions, the 1st reduces 4 chromatids to 2 in the daughter cells and the 2d reduces 2 to a million, in the two an egg or sperm cellular. each of those has a million reproduction of each chromosome, waiting to fulfill up with yet another set from the different germ cellular, so as that a sparkling guy or woman with 2 copies of each chromosome would be created. it is common for human beings and different mammals yet there are various diverse reproductive systems around, some without meiosis, or meiosis in in basic terms one intercourse.

Answer 3

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