How does DNA replication make it possible to produce two identical cells from one parent?

Answer 1

mitosis. mitosis is the duplicatuin of body cells
1st step of mitosis= chromosomes duplicate(interphase)
2nd= chromosomes pair up(prophase)
3rd= chromosomes line up in the middle of the cell(metaphase)
4th=chromosomes break apart, and go to each en of cell(anaphase)
5th=cytoplasm breaks so that cellcan break away(telophase)
6th= 2 new daughter cells are made (cytokinises)

Answer 2

As we know the gene on the DNA code for all the characteristics of the cell.So if the DNA is passed on intact to the daughter cells both the daughter cells will be identical.this happens through the process of mitosis.during the S phase of mitosis the dna of the parent cell is replicated i.e an exact copy is made.mitosis has 4 stages:Prophase ,Metaphase,Anaphase and Telophase.In prophase the nuclear envelope disintegrates and the and the chromosomes form chromatin thread .In metaphase these threads are aligned in the centre of the cell horizontally.In anaphase with the help of asters the chromatin threads are equally distributed to the anterior and posterior end of the cell and in telophase cytokinesis takes place i.e the cell divides into 2.this results in the distribution of a copy of the parent DNA to each daughter cell resulting in identical cells.

Answer 3

Human DNA is shaped like a set of helical ladders using four different types of rungs. During cell division, each new cell takes half of each ladder (gene) split right down through the rungs and each half is then surrounded by cellular soup that reconstructs the missing ladder half. The new cell will be identical to the old cell unless differentiation takes place and a change in tissue is specified by the remarkable code or blueprint contained in the DNA. Scientific explanations make more sense when you know roughly what is actually taking place.

Answer 4

In the S phase of the cell cycle, DNA is synthesized that a normal somatic cell that contains 2n chromosomes now contains 4n. This allows the cell to divide, giving each cell the normal 2n compliment of chromosomes. Since the DNA in both cells has one strand from the parent and one duplicated strand, the DNA in both cells are identical, which produces two identical daughter cells.

Answer 5

http://mywebpages.comcast.net/biologycentury/pages/mitosis3.html


The schedule of DNA replication and separation: the cell cycle

Since cells contain large amounts of DNA organized in large numbers of chromosome pairs, the process of replication and segregation of the chromosomes must be carefully regulated. Cells organize the processes of replication and segregation temporally into something called the cell cycle.

Among identical cells in a population the events of cell growth, DNA replication, chromosome separation, and cell division occur on a common schedule. Cells continuously increase in size after dividing. After it has grown to a particular size (which corresponds to a particular time after division) each cell will begin to duplicate its DNA. DNA duplication, or "replication", takes about the same length of time in all cells.

After duplication cells continue to grow. They then begin to divide at about the same size, at about the same time after replication ends.

After duplication cells continue to grow. They then begin to divide at about the same size, at about the same time after replication ends.

This process can be envisioned as a clock separated into four major sectors

M Mitosis Nuclear division (chromosome segregation) and cell division
G1 Gap 1 Period of growth before beginning DNA replication
S DNA Synthesis Period of DNA replication
G2 Gap 2 Second period of growth following the end of DNA synthesis

The three periods--G1, S, and G2--are also referred to collectively as interphase since they constitute the period between successive mitoses. They are also pooled collectively because the cells do not differ morphologically during this phase, and early microscopists could only distinguish mitotic from interphase cells

The cell cycle for an "average" human cell is about a day, while for a yeast cell it is 90 minutes.

Answer 6

DNA replication itself doesn't actually facilitate the process of mitosis, but each daughter cell of the parent needs genetic material, so it's necessary to replicate the DNA so that they each get a copy.