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Why replication of human chromosomes would takes so long with a single replication?
Because human DNA is so very long (with up to 80 million base pairs in a chromosome) it unzips at multiple places along its length so that the replication process is going on simultaneously at hundreds of places along the length of the chain. Eventually these areas run together to form a complete chain. In humans, DNA is copied at about 50base pairs per second. The process would take a month (rather than the hour it actually does) without these multiple places on the chromosome where replication can begin.
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If a body cell has 46 chromosomes during g1- how much DNA will be in the cells during s an g2?
During S phase, the DNA in the cell replicates, resulting in each cell having 92 chromosomes (since DNA replication is completed). During G2 phase, the cell still has 92 chromosomes, but each chromosome consists of two sister chromatids, so the total amount of DNA is the same as in S phase.
How many chromosomes produce a cell?
In humans there are 23 pairs of chromosomes in a diploid cell (a normal body cell e.g. a skin cell) However there are just 23 single chromosomes in a haploid cell (a sex cell e.g. a sperm) this is because when fertilisation takes place the embryo has a total of 46 chromosomes, as it takes both haploid cells, making it genetically identical to both it's mother and father, and making it a diploid cell.
Which period are chromosomes duplicated in?
Chromosomes are duplicated during the S phase of the cell cycle, which occurs during interphase. This is when DNA replication takes place to ensure that each daughter cell receives a complete set of chromosomes during cell division.
DNA replication interphase or metaphase?
DNA replication occurs during the interphase of the cell cycle, specifically in the S phase (synthesis phase), when the cell prepares for division. During this phase, the DNA is unwound and duplicated to ensure that each daughter cell receives an exact copy of the genetic material. In contrast, metaphase is a stage of mitosis where chromosomes align at the cell's equatorial plane, but no DNA replication takes place at this stage.
What stage of mitosis does replication happen in?
Replication does not take place during mitosis. It takes place before meiosis begins.
Where does DNA replication take place in humans?
DNA replication takes place in the nucleus of human cells.
Where does DNA replication takes place?
DNA replication takes place in NUCLEUS
If a body cell has 46 chromosomes during g1- how much DNA will be in the cells during s an g2?
During S phase, the DNA in the cell replicates, resulting in each cell having 92 chromosomes (since DNA replication is completed). During G2 phase, the cell still has 92 chromosomes, but each chromosome consists of two sister chromatids, so the total amount of DNA is the same as in S phase.
What is general definition of replication?
Replication is the process of copying genetic material, such as DNA or RNA, to produce an identical or similar copy. In biology, it plays a crucial role in cell division, growth, and repair. Replication ensures that genetic information is passed on accurately from one generation to the next.
What is the job of the nucleus cell?
Nucleus has various functions, but its distinctive feature is that it holds the DNA/chromosomes. Additionally to DNA replication, transcription of DNA into mRNA also takes place in the nucleus.
The period in which chromosomes duplicate?
Chromosomes duplicate during the S phase of the cell cycle, which occurs after the G1 phase and before the G2 phase. In this phase, DNA replication takes place to create identical sister chromatids that will eventually be separated during cell division.
Where does replication of the two DNA strands takes place?
in a direction opposite to that of the replication fork
Replication of the two DNA strands takes place?
In the same directions of the replication fork
Where does DNA replication take place?
DNA replication takes place in the nucleus of a cell.
How many chromosomes produce a cell?
In humans there are 23 pairs of chromosomes in a diploid cell (a normal body cell e.g. a skin cell) However there are just 23 single chromosomes in a haploid cell (a sex cell e.g. a sperm) this is because when fertilisation takes place the embryo has a total of 46 chromosomes, as it takes both haploid cells, making it genetically identical to both it's mother and father, and making it a diploid cell.
Where does DNA replication begin-?
The DNA replication machinery initially assembles and begins replication at the origin of replication. It contains high levels of AT base pairs for easier unzipping and there's usually one per bacteria chromosome, several for archaea chromosome, and many many more for eukaryotic linear chromosomes.
How long does it take for the human body to produce a single sperm cell?
It takes about 64 to 72 days for the human body to produce a single sperm cell.
