DNA synthesis occurs during S ..
11/10/2009 · DNA synthesis (or replication) occurs during this phase
In the cell cycle DNA synthesis occurs during interphase.
The initial stage of the cell is known as Interphase. It directly paves the way for mitosis, or cell division, and is the state in which the cells use up the majority of its existence. Interphase is a stage in the cell when a cell doubles its cytoplasm and synthesizes DNA. Interphase is also considered to be the 'living' phase of the cell, in which the cell obtains , grows, reads its DNA, and conducts other "normal" cell functions. The cells increase its size and make a copy of its DNA, during cell division. In interphase, the cell gets itself ready for mitosis, the process by which a eukaryotic cell separates the chromosomes in its cell nucleus into two identical sets in two nuclei or meiosis, a type of cell division necessary for sexual reproduction. Interphase can be predictable, under a , since the nuclear membrane (a layer that surrounds the material) is unbroken, and chromosomes are not visible, though the nucleolus (a non-membrane bound structure) may be noticeable as an enlarged dark spot.
DNA replication means that each strand of DNA is being split into 2 copies.
What is DNA Replication?
Where does DNA Replication occur?
When does DNA Replication happen?
How does DNA Replication happen?
What is Transcription?
Where does Transcription occur?
When does Transcription happen?
How does Transcription happen?
What is Translation?
Where does Translation occur?
When does Translation happen?
How does Translation happen?
How are the processes affected by radiation?
What types of radiation can affect these processes?
What are some effects of radiation?
DNA mostly resides in the nucleus of the cell, so this is the site of replication.
It is replicated during mitosis.
DNA synthesis (or replication) occurs during this phase
The only times when transcription may not occur is during DNA replication, when the entire DNA molecule is unzipped and copied (occurring only during S-phase in a portion of the cell cycle called Interphase) and may also be limited during Mitosis, when the DNA is in a condensed state that would make transcription difficult.
Transcription is the process in which the instructions on the DNA molecule are copied out onto an RNA molecule.
Meiosis and mitosis share obvious cellular processes, and it makes sense that meiosis evolved from mitosis. The difficulty lies in the clear differences between meiosis I and mitosis. Adam Wilkins and Robin Holliday summarized the unique events that needed to occur for the evolution of meiosis from mitosis. These steps are homologous chromosome pairing and synapsis, crossover exchanges, sister chromatids remaining attached during anaphase, and suppression of DNA replication in interphase. They argue that the first step is the hardest and most important, and that understanding how it evolved would make the evolutionary process clearer. They suggest genetic experiments that might shed light on the evolution of synapsis.
DNA synthesis occurs only during ..
Sexual reproduction requires that diploid organisms produce haploid cells that can fuse during fertilization to form diploid offspring. As with mitosis, DNA replication occurs prior to meiosis during the S-phase of the cell cycle so that each chromosome becomes a pair of sister chromatids. In meiosis, there are two rounds of nuclear division resulting in four nuclei and usually four daughter cells, each with half the number of chromosomes as the parent cell. The first division separates homologs, and the second—like mitosis—separates chromatids into individual chromosomes. Meiosis generates variation in the daughter nuclei during crossover in prophase I as well as during the random alignment of tetrads at metaphase I. The cells that are produced by meiosis are genetically unique.
A Science Odyssey: You Try It: DNA Workshop
An embryonic cell divides again and again
Where there was one cell there are two, then four, then eight,..
DNA is a long polymer made from repeating units called nucleotides
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