Decondensed chromatin, but not condensed chromatin O can be remodeled. is associated with methylation of CpG islands. O is often acetylated. O is packed into nucleosomes.
Oogenesis
The formation of the ovum (mature female gamete) from undifferentiated germ cells is called oogenesis. This process takes place in the ovaries (female gonads). Oogenesis consists of three stages known as the multiplication phase, growth phase, and maturation phase.
Cell Division
Cell division involves the formation of new daughter cells from the parent cells. It is a part of the cell cycle that takes place in both prokaryotic and eukaryotic organisms. Cell division is required for three main reasons:
DNA is the nucleic acids present in the organisms. DNA is the deoxy ribose nucleic acid in which ribose sugar molecules with nucleic acid bases. DNA is transcribed into messenger RNA and this m RNA undergoes translation into proteins.
So, the DNA which carries the genetic information of the entire organism is long double stranded, which cannot fix in the nucleus. So, the DNA along with some histone proteins compact the structure into a chromosome and the substance is also called as chromatin.
Euchromatin is the less compactly condensed area of the chromosome , which contains the mostly transcribed genes because it is less condensed polymerase enzyme can bind it and can start the replication process.
Heterochromatin is the most tightly condensed area of the chromosome. Which do not contain the transcribed genes, the genes present in this region are not transcribed because it is so much tightly condensed that it the polymerase enzyme is not able to bind it to start the replication process.
During replication the condensed chromosomes loosen and appear as DNA strands which are easily accessible for RNA polymerase after that the DNA again condenses back with the help of histone proteins.
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