Questions tagged [mitosis]
The eukaryotic process characterized by replication of nuclear DNA and formation of a second identical nucleus. Separate from cytokinesis.
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What's the difference between a mitogen and a cell cycle stimulant substance?
It's been a week since I got this question asked and I still have no clue. I have thought that the main difference would be that the mitogen induces mitosis, and the cell cycle stimulant substance ...
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What determines whether a cell divides by Mitosis or Meiosis?
What I learn from biology class is that mitosis is for producing somatic cells in animals and the gametes of some plants. And meiosis is for production of animal's gametes.
I am curious about what ...
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Could multiplexed CRISPR disable the mitotic and meiotic genes of cancerous cells?
Although I believe there is a good reason -- or reasons -- why this theory, that CRISPR could disable the genes for division in cancerous cells, is incorrect, I haven't been able to find them.
In ...
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After interphase,there are 2 chromatids in each chromosome so how many total chromosomes are there in a cell
Before interphase each chromosome now has 1 chromatid. After interphase each chromosome replicates and has 2 chromatids so how many chromosomes are there totally.
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Why do zygotes divide internally and not externally?
As far as I understand, two gametes fuse to create a zygote. Gametes are created via miosis, they are haploid and when they fuse they become a complete cell (diploid). And diploid cells divide via ...
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Does the smoke produced by tobacco affect mitosis in vegetables (plant cells)?
There is a plethora of literature and research studies on the effects of tobacco on the human body and other animals.
I am interested in knowing whether the rate of mitosis in plants is affected by ...
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What does this statement pertaining to fission mean?
I was reading about fission on Wikipedia when I encountered the following statement under Fission of prokaryotes section.
Like in mitosis (and unlike in meiosis), the parental identity is lost.
What ...
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temperture on rate of mitosis in plants
does an increase in temperature cause an increase/decrease in the rate of mitosis (ie) the rate of cell division increases, more cells are undergoing mitosis at a higher temperature? mitotic division ...
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What is bacterial (prokaryotic) cell division called?
Eukaryotic asexual cell division is sometimes referred to as mitosis, although this is more strictly used to refer to the specific stage at which “the replicated chromosomes separate into two new ...
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How is RNA content distributed in daughter cells during cell division?
During cell division, DNA becomes equally distributed between the daughter cells. But how is RNA content distributed in the daughter cells?
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mRNA vaccine and cell mitosis
What happens with the injected mRNA when cells are in the different stages of the mitosis process? Does the mRNA enter the cell and behaves normally throughout the mitosis phases?
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Why is the number of cells virtually a constant?
Going back to highschool, I learnt about mitosis: in order to renew their cells, eucaryots' cells divide themselves into two copies.
But my course didn't cover what moderate the replication. By ...
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Is the cell cycle applicable to meiosis as well, or just mitosis?
All the diagrams I can find, show the cell cycle as having G1 phase (growth 1), S phase (DNA replication), G2 (growth 2) before the Mitotic phase (mitosis + cytokinesis).
Is there an equivalent "...
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Why is a cell in anaphase (without a nuclear envelope) be considered as a eukaryotic cell?
Can anyone shed some light on this? All I can think of is that it has something to do with the chromosomes being paired
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Does anyone know any statistics about the rate of cell division of malignant cells?
I've tried to look online to find some statistical data about the rate of growth of any type of cancerous cells, but haven't been able to find any. Would anyone know an appropriate time period for a ...
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What's the difference between the spindle assembly checkpoint (SAC) and mitotic checkpoint complex (MCC)? [closed]
Are the SAC and MCC two separate complexes? Does the SAC activate the MCC? Thanks
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Are cells guaranteed to get at least one mitochondrion when they divide?
If mitochondria exist at random within a cell, isn't there a possibility that cell division will result in a daughter cell with no mitochondria? If not, what is the process for guaranteeing at least ...
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My understanding of chromosomes and the processes related to them is lacking [closed]
I'm sorry for the incredibly simple question, I just can't seem to find any answers elsewhere online.
I am a high school student currently studying for the upcoming AP biology exam, and recently I ...
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Apart from nerve cells and muscle cells, what types of cells do not undergo mitosis in adult man?
Neurons and muscle cells in adult humans do not have the ability to divide by mitosis, so they can not repair themselves and their cell cycle remains in the interphase. I’m looking for more cells with ...
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Can a dividing cell that skipped DNA replication become cancerous?
Let's assume that a cell fails to replicate its DNA during the S Phase of the cell cycle. Let's also assume that the appropriate CDKs are inactive (perhaps due to mutation or lack of cyclin proteins ...
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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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How exactly does mitotic recombination help repair damaged DNA?
I understand the utility in crossovers during meiosis, but how exactly is mitotic recombination useful for dealing with DNA damage? If one sister chromatid is damaged, the other can supply a ...
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How are chromosomes counted at the end of mitosis in a plant cell?
Page 89 of the Study Guide for Campbell Biology, 11th Edition has the following question:
A plant cell has 12 chromosomes at the end of mitosis. How many chromosomes would it have in the G2 ...
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Do chromosomes line up as pairs in mitosis or meiosis?
Here is a question from the book SAT II Success Biology E/M (where the SAT is the exam taken by the American high school students):
Homologous chromosomes line up in pairs in
(A) metaphase of ...
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With over 400 chromosomes, does mitosis in a species of butterfly happen in the same way as in humans?
The beginning of the Ars Technica article Gene editing crunches an organism’s genome into single, giant DNA molecule begins:
Complex organisms have complex genomes. While bacteria and archaea keep ...
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Sucrose inhibits onion root mitosis? Why?
I am doing an experiment about the growth of onion roots.
I put onion plants in different solutions of sucrose in water — 0.1M, 0.2M, 0.3M, 0.4M, 0.5M — with the root touching the water.
Measurements ...
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How does gene affect organs development in eukaryotic cells? [closed]
I'm totally new to biology and apologies if you find this basic. The central dogma insists that genetic information flows in this direction:
DNA -> RNA -> proteins
So far so good, it is very clear ...
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DNA replication during Mitosis
I am a bit confused.
During Meiosis, DNA is replicated to form a cell with half the DNA and likely to have variations.
But since the replication process of meiosis and mitosis are the same, why do DNA ...
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Unsure about definition of "n" and "C" values in mitosis
I am preparing for a Biology exam and I'm reviewing the "n" and "C" notation used in mitosis.
My professor said that when the cell replicates its DNA in S phase of mitosis, we get twice the "amount" (...
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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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Can 12 mitotic divisions produce 6000 nuclei?
The following quote is from "Principles of Development" by Tickle & Wolpert:
"After fertilization and fusion of the sperm and egg nuclei, the zygote nucleus undergoes a series of rapid mitotic ...
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Why does colchicine not affect the source plant itself?
Colchicine, being a mitotic poison that blocks spindle fibre formation, should affect its source plant. It should also stop its cells from dividing. So how do they grow?
I think that there might be ...
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Cell organels during cell reproduction
When one studies cell division, usually the process is explained through what happens with the DNA of the cell, particularly, that in eukaryotes the nucleus dissolves. But what happens to the rest of ...
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Is aneuploidy/aneusomy only a problem for cell division?
One of my textbooks states that:
"recent studies suggest that aneuploidy can be seen in upwards of 10% of human brain cells without any noticeable effects"
I do know that trisomy 21 causes ...
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How does the spindle fiber find the kinetochore?
I am curious if anyone knows the exact mechanism of how exactly does the spindle fiber find the kinetochore? it certainly seems like a fairly non-spontaneous reaction for a spindle fiber to reach all ...
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During interphase, is DNA wrapped around histones?
Are histone proteins present around DNA in the nucleus during all of interphase (including G1) or do histone proteins only form later on when chromosomes are condensing into chromatids?
Thanks in ...
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Why does abnormal mitosis takes place in the cells of tapetum?
I know that the tapetal cells present in the anther are binucleate. I also know this means that after karyokinesis the cell does not divide itself and instead form a syncytium. This occurs due to ...
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Purpose of intensive protein synthesis in G1 phase of mitosis
What is the purpose of intensive protein synthesis in G1 phase of mitosis, and what purposes do these synthesized proteins serve? Why are lipids and carbohydrates not synthesized intensively as well?
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MCQ - Events in the Mitotic cycle
The following question confused me at first
However, I presumed that it must be in comparison to meiosis. In that case D would be correct.
However, the correct answer is A.
How can this be? I know ...
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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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What is the purpose of two cell divisions in meiosis?
At the moment, my thoughts are that the two cell divisions are necessary for recombination to occur, although I am not sure. I cannot really see why technically, the chromosome from each parent cannot ...
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Separation of sister chromatids diring anaphase without Centrosomes in plant cell during mitosis
As in animal cell during mitosis sister chromatids are separated from each other during Anaphase by the pulling of kinetochore fibers toward their originating poles of centrosomes but as we know that ...
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How many cells are in prophase on this onion root tip slide?
In the following image, I have to identify the cells in the different phases (not counting the cells that are too faded to see), and it's fairly easy to identify metaphase, anaphase, and telophase, ...
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Why isn't meiosis II called mitosis (as the chromosome number doesn't half)?
Meiosis: a type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell, as in the production of gametes and plant spores.
Mitosis: a type of ...
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Why do some organelle (like ER and Golgi complex) cannot be seen under microscope during cell division?
I have recently read in a book that organelles like ER (endoplasmic reticulum) and Golgi Complex cannot be seen under a compound microscope during cell division. Why does this happen, and where do the ...
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How can I determine where meiosis occurs in the life cycle of a plant?
To fill out this diagram with the mitosis, meiosis, and ploidy , we start with the definition that spores are haploid (N).
Based on knowing that as the sperm and eggs are N, the gametophyte is also ...
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What is a centrosome?
I know that a centrosme is composed of two perpendicular centrioles, but the following sentences of Wikipedia confuse me:
Interestingly, centrioles are not required for the progression of mitosis.
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Mitosis and Colchicine
I'm preparing for an Olympiad and while I was going through some of the old papers I found a question. I googled it but a lot of people have different answers to it. Please help.
A student treats ...
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Reproduction or Cell division
Most of the cells in multicellular organism undergoes cell division through Mitosis.
While most of the single celled organism reproduces through binary fission by mitosis.
In both cases,the ...
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Why don't onion root tips show mitotic stages?
It was back in the winter that we did the Onion root tip experiment in college. We were able to see wonderful stages but now in this monsoon-autumn transition the root tips hardly show any mitotic ...