Before mitosis begins, the chromosomes in a cell replicate. This occurs during the S (synthesis) phase. Chromosomes need to replicate so that when the cell divides at the end of mitosis, the daughter cells each recieve a copy of the chromosomes.
The chromosomes make copies of themselves. Its called replication.
They duplicate.
prosphase
Before mitosis and meiosis, DNA is loose in the form of chromatin, then it coils into chromosomes right before the mitosis and meiosis.
In the beginning of mitosis the number of chromosomes double. But since during mitosis the chromosomes are divided between the two daughter cells the number of chromosomes at the end is the same number as the beginning before doubling.
This depends both on the cell undergoing mitosis and the stage in mitosis which is currently underway. Humans have 46 chromosomes per cell, but in some stages of mitosis have 92. Dogs have 78 chromosomes, but at some stages of mitosis have 156.
Before the nuclear envelope of a cell breaks down during the mitosis process, the DNA has to be duplicated. After the envelope dissolves, the chromosomes separate, then the cell finally splits.
Two sets of chromosomes must be available before mitosis so that each of the two daughter cells will have an entire set of chromosomes
You have 24 before, and 12 after.
They double into more chromosomes.
during
Before mitosis and meiosis, DNA is loose in the form of chromatin, then it coils into chromosomes right before the mitosis and meiosis.
The number of chromosomes in the nucleus before mitosis is dependent on the species. The exact number is called the ploidy of the animal.
Amount of DNA that has been doubled
In the beginning of mitosis the number of chromosomes double. But since during mitosis the chromosomes are divided between the two daughter cells the number of chromosomes at the end is the same number as the beginning before doubling.
both will have 30 chromosomes.
during mitosis and meiosis because the condensed chromosomes are thicker and therefore more prominent.
It will have 18 chromosomes at the end of mitosis.
Interphase. The process of meiosis has many similarities to the process of mitosis: chromosomes replicate before the process begins, and shorten and thicken to look like the chromosomes at the beginning of mitosis (condensation).
Chromatids condense into an X shape before mitosis. Chromatids are identical strands of chromosomes. After duplication there are 12 chromatids that are in 3 pair of homologous chromosomes.