Chromatin condenses to form chromosomes during prophase of mitosis, and during prophase I and prophase II of meiosis. Chromatin is a dense, complex fibrous structure composed of associated proteins and molecules of deoxyribonucleic acid, or DNA, which contains the genetic material of an organism.
The two types of cellular division for multicellular organisms are called mitosis and meiosis. Mitosis produces two diploid daughter cells, while meiosis produces four haploid daughter cells. The prophase stages of both processes basically undergo the same steps. The chromatin is condensed 10,000 times into chromosomes to fit inside the nucleus of a cell, where cellular division occurs. When the chromatin becomes tightly packed, the replicated chromosomal DNA, called sister chromatids, are connected at the centromere.Learn More
Chromosomes become visible during prophase, the stage of mitosis during which the nuclear envelope disappears and the chromosomes shorten and condense. After prophase, chromosomes remain visible until mitosis completes.Full Answer >
The chromosomes in a cell's nucleus coil during prophase of mitosis in order to facilitate mobility. The chromosomes and the DNA become coiled and condensed during prophase.Full Answer >
Tetrads, four-part structures made up of two homologous chromosomes, form during prophase I of meiosis. During this phase, chromosomes exchange genetic material with other chromosomes in the tetrad. The process is referred to as crossing over and is how genetic variation occurs.Full Answer >
Chromatin is a combination of different things that make up chromosomes. This combination includes DNA, histone and other proteins. Chromatin can be found in eukaryotic cells in the nuclear envelope.Full Answer >