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Questions tagged [cell-division]

Cell devision is the process in which one parent cell divides into two daughter cells. The interiour (cytoplasm, DNA, mitchondria etc.) of the parent cell is divided between the two new cells.

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Beyond anabolism, what are factors that restrict growth rate?

Beyond obvious constraints in the case of nutrient limitation, what can explain the relatively slow growth rate of cells in rich media? Lab strains of E. coli grow really, really fast. The cell ...
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How do adult differentiated somatic cells divide?

My textbook (which is Biotechnology by David P. Clark) states, when talking about fate-mapping potential stem-cells: "If the marked cell is not a stem cell, the marker will not be passed onto ...
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When two amoeba cells form from one amoeba, does spindle fibers form?

When two amoeba cells form from one amoeba, does spindle fibers form? Some sources say that spindle fibers do not form while an amoeba cell is undergoing cell division. If spindle formation does not ...
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Which is the correct term haploid daughter cells or haploid parent cells?

Meiosis 2 begins with 2 haploid parent cells and ends with 4 haploid daughter cells (gametes). Gametes from the opposite sex can now merge together and fertilize. If I were to refer to a specific ...
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288 views

How long does each of the stages in meiosis take?

For each stages of meiosis (i.e. Interphase, Prophase I, ...), I wanted to know the time between each stages either in percentages or minutes. However, while I could find the cell cycle for mitosis ...
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208 views

Can a viable embryo develop from the fusion of two egg cells?

For a zygote to form, two haploid gametes undergo meiosis and fuse during fertilisation. Since two egg cells (or even two sperm cells) are both haploid, is it theoretically possible for them to make ...
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How did genome replication first synchronise with cell division?

It is obvious that cell division in living organisms is now synchronised almost perfectly with DNA replication and, furthermore, the line of division has to intersect exactly the space between the two ...
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75 views

Why are humans only so tall/large?

In biology I've learned that cells rapidly divide and can grow and split undefintely, and that certain parts of the body have to grow and evolve before growing, but I am tied up on the fact that the ...
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257 views

What organism has the longest Hayflick Limit?

Assuming I am understanding the concept correctly, Hayflick Limits are reflective of a cells capacity for stable division. Additionally, the Hayflick Limits of various organisms differs. My question ...
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59 views

Why are stem cell therapies more preferred (theoretically) over current measures?

i understand that when stem cells are used to treat injuries using induced pluripotent stem cells (IPS), they can prevent the risk of having any tissue rejection and thus, there isn't a need for use ...
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175 views

Stem Cell Replication

Reading from the internet, I've come across quotes that said stem cells have the potential to replicate indefinitely. However, there are other sources that say cells that are specialised will have ...
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Why does cell waste energy in meiosis, between meiosis 1&2

As far as I have learnt about meiosis I have read that anaphase 1 is followed by telophase 2 where chromosomes change back to reticulum.but in the very next stage i.e prophase 2 they again start ...
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Mitosis in free nuclear divisions

When free nuclear divisions occur(for instance in endosperm formation in coconut etc)....there are many nuclei undergoing kartokinesis at a given point of time...so that means each karyokinesis will ...
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Names of different cyclins

Different types of cell cyclins are designated as a to y Why are some letters like m, n, p, q.. etc. skipped? Source: https://en.wikipedia.org/wiki/Cyclin
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When does the kinetochore form?

According to Wikipedia, the outer plate... is assembled in the surface of the chromosomes when the nuclear envelope breaks down. However is makes not mention of when the inner portion of the ...
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Genetic information storage and the extent to which it controls appearance/structure

So there are often articles about cloning from a small piece of tissue etc. My question is (two actually) Is the Complete information about entire organism's structure stored (as in duplicated) all ...
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379 views

How are germ cells not reduced in number?

If germ cells produce haploid daughter cells by meiosis and are thereby "consumed" (where there was a germ cell there are then 4 daughter cells), where do the germ cells come from? I asked my biology ...
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Why doesn't cellular, replicative senescence (or the hayflick limit) constrain the normal development of an organism?

The wikipedia article on cellular senescence states: Cellular senescence is the phenomenon by which normal diploid cells cease to divide. In culture, fibroblasts can reach a maximum of 50 cell ...
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507 views

How do cells determine what size to grow to before dividing? [closed]

How do cells determine size to grow to before dividing?
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344 views

How far is stem cell research from being to generate a new organ?

How far are we from being able to use stem cell research to generate a sperm, a heart, a liver, and a kidney? In stem cell research, my understanding is that you must start off with some cell to ...
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579 views

How do cells age and die if they are dividing into new cells?

If cells in our body keep on dividing into new cells how do they ever grow old? The only cells to grow old would be defunct cells or those who won't divide into new cells like nerve cells. What am I ...
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What are chiasmata?

I have a confusion in understanding what chiasmata are. My ‘NCERT’ book says ‘The beginning of diplotene is recognised by the dissolution of synaptonemal complex and the tendency of the recombined ...
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751 views

How do stem cells produce 200 billion new blood cells every day? Does 1 stem cell division result in production of just 1 blood cell or many?

It is given on wikipedia that everyday 200 billion new blood cells are produced in the bone marrow. I want to understand how this is achieved. Does one hematopoietic stem cell's single division result ...
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How can neurons divide without centrioles?

I have read in my studies that neurons lack centrioles. If that is so, then how is it possible that new neurons are added to our brain? Does this have anything to do with memory loss?
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Is there one centomere for the two chromatids in a dyad? [closed]

I have no explanation for this. It is all I have to ask. Thank you
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1answer
589 views

Why does HPV Infect Squamous Epithelial Cells and Not Others?

I've seen this question about HPV and the reference therein. The link states "Human papillomavirus (HPV) is a DNA virus that presents tropism for epithelial cells, causing infections of the skin and ...
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1answer
8k views

Do human somatic cells have 46 chromosomes all the time?

As far as I know, a human somatic cell has the cell cycle: Interphase and Replication (mitosis). In interphase, the cell has 2 growth phases (G1 + G2) and a synthesis one (S phase being in between ...
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Do chromosomes uncoil in interphase II?

During interphase II, there is no S phase in which DNA replicates. However, in this stage, do the chromosomes remain wound? Or have they unwound into chromatin form, and recondense during prophase II?
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Are surface area or volume conserved during cell division?

I am a student of physics of mathematics with very little knowledge of biology. Nevertheless, I am very keen on biophysics and I'm trying to learn the biological concepts that I need on the way. I'm ...
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1answer
450 views

Hayflick limit and hair or nails

I am not a bio major but I have heard about Telomerese shortening in each cell division which leads aging and cellular death. I also read that Hayflick limit is about the number of divisions a cell ...
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770 views

DNA content doubling in interphase

Why does the DNA content of a cell get doubled in interphase? Why doesn't it become tripled or quadrupled? What's stopping it from doing so?
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Are free-nuclear division and endomitosis the same?

As far as I understood it, both are cases of karyokinesis, not followed by cytokinesis.
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Contact Inhibition of Cell Division: Signaling Pathway

The following article refers to contact inhibition of cell division in epithelial cells, specifically MDCK cells: Collective and single cell behavior in epithelial contact inhibition. In their review ...
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15k views

Why doesn't crossing over happen in mitosis?

If there was crossing over in mitosis, then there would various nature of somatic cells. May be that's the logic, but what is the mechanism? Why are there no crossover events during mitosis?
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What mechanism prevent Colchicum Autumnale from being affected by Colchicine

Colchicine is a chemical usually used to cause polyploidy mutant by inhibiting chromosome segregation. It is synthesized in the Colchicum Autumnale. But what mechanism prevent C. Autumnale from being ...
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Why can't neurons undergo cell division?

Many cells in the human body can divide and reproduce, making healing possible. Neurons, however, cannot reproduce, which makes diseases affecting the brain particularly crippling. Why can't neurons ...
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With an excess supply of nutrients, in how much time will the number of algae cells double in full sun?

I am growing algae in a container in my roof. It gets sunlight for the whole day as there are no clouds nowadays in my area. There is no lack of nutrients as I am constantly adding water mixed with ...
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1k views

How does a fertilized egg form 23 pairs of chromosomes?

I am always confused about this...so when one cell which has 23 pairs of chromosomes undergoes the two meiotic divisions it produces four cells containing 1 chromatid of every chromosome pair so when ...
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79 views

how cells make other macro molecules?

We know that the nucleus of the cell is the White House of the cell and its DNA is the president and it commands to make protein. So my question when DNA only codes for protein and enzymes,after the ...
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930 views

Meiosis vs. Mitosis

Meiosis is a type of cell division that reduces the chromosome number from 2n to n to make gametes viable for reproduction in humans. I know that during meiosis, there is independent assortment and ...
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Rate of cell division in humans

On average, how many cells divide each day in a human being? How long does a cell wait before dividing itself ? I have tried to look on the internet but surprisingly the answer is difficult to find.....
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An over-simplified model of cell division and its relation to stem cells

I am a mathematician, and I decided to try to model cell division with math and see what conclusions came out of it. I had some questions concerning stem cells that came up in the model. In an ...
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396 views

Asexual reproduction and Telomeres

Many eukaryotic organisms like yeasts, hydras , planarias, plants etc reproduce asexually. Replication of End of linear DNA pose a limit to the number of cell divisions. My question : Do asexually ...
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3k views

Cell life: division for immortality or reproduction with aging

Are the two cells that are derived from one cell, ‘twin sisters’ or a ‘mother and a daughter’? In other words, can a cell really be divided to live an "immortal" life or is cell reproduction the ...
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Henrietta Lacks Cell Line - Immortality

I'm a newbie in biology and medicine. I understand that Henrietta Lacks provided the cells that formed the HeLa cell line with which much research has been done. Henrietta Lacks died of cancer. If we ...
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Distinguishing between mitotic metaphase and metaphase II of meiosis

I'm sorry if this seems like a silly question, but I was brushing up on some cell cycle dynamics and realized that everyone was talking about the differences between metaphase I and II, and since ...
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684 views

Why are centrioles aligned at 90 degree with each other?

The centrioles are aligned at 90 degree with each other. What is the function of this?
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54k views

How do plant cell divide without centrioles?

Most plants do not have centrioles , so What organelle lets them multiply?