25
votes
Accepted
Are cells guaranteed to get at least one mitochondrion when they divide?
Isn't there a possibility that cell division will result in a daughter
cell with no mitochondria?
Yes, there is always the possibility. However, there must be a strong negative selection pressure ...
- 6,192
13
votes
Are cells guaranteed to get at least one mitochondrion when they divide?
In addition to S Pr's excellent example, I wanted to point out that some very recent research describes some special behavior in oocyte development specifically related to mitochondria selection.
...
- 407
11
votes
3 flaws of genes from the perspective of a programmer
Your individual questions here are reasonable enough - although you could do a bit better at knowing some more details of the systems you are dismissing as 'flawed'. However, I think the bigger ...
- 880
11
votes
Are cells guaranteed to get at least one mitochondrion when they divide?
A typical animal cell has 1000-2000 mitochondria. From a statistical point of view, assuming a random distribution of the mitochondria and that the cell splits in half, the probability of having 0 ...
- 241
8
votes
Accepted
Why does colchicine not affect the source plant itself?
Colchicine is an alkaloid and a secondary metabolite of the plant- a crocus, primarily functioning to protect the plant (like, from consumption by herbivores).
WHY COLCHICINE DOES NOT AFFECT THE ...
- 1,955
8
votes
Accepted
3 flaws of genes from the perspective of a programmer
In programming, if you need to ensure your data has integrity, a single array won't do.
We have cyclic dependency checks in programing to determine if the data is corrupt. We have hamming codes to ...
- 265
6
votes
Accepted
Mitosis versus Meiosis I: What's the difference?
At the start, all the cells are 2n, diploid cells. By far the largest difference between meiosis I and mitosis is that mitosis results in genetically identical, diploid somatic cells. Meiosis, in it's ...
- 8,101
6
votes
Accepted
What is the difference between the mitotic spindle and microtubules?
Short answer
The spindle is made up of microtubules
Background
From Nature:
Spindle fibers form a protein structure that divides the genetic
material in a cell. [...] At the beginning of nuclear ...
- 52.3k
5
votes
Accepted
MCQ - Events in the Mitotic cycle
Cell cycle can be divided into two phases:
1. Interphase
2. M-phase(Mitotic phase)
Note: M-phase can also mean Meiotic phase but it is not the full form of the acronym.
So M-phase in mitosis has ...
- 8,784
5
votes
Why isn't meiosis II called mitosis (as the chromosome number doesn't half)?
Well, in my opinion, the entirety of the meiosis is a process (reproduction of sex cell) in which two levels of division occur, it's all kind of one process. Though meiosis II may seem to have many ...
- 864
5
votes
Accepted
Apart from nerve cells and muscle cells, what types of cells do not undergo mitosis in adult man?
To answer the numbered questions:
In general, neurons never divide by mitosis. However, I believe you may have unintentionally misphrased your question; there are functional neural stem cells in the ...
- 258
4
votes
In cell division, are daughter cells identical?
Actually, the answer is not obvious. @RoSiv gives the textbook case of symmetric cell division, where the two new cells can indeed be considered identical, and this is valid in many cases. But there ...
- 5,675
4
votes
How are germ cells not reduced in number?
In case of gametogenesis (let us talk about spermatogenesis) gametes are formed from meiotic division of Primary spermatocytes.
In Primates Primary spermatocytes are cells that that are formed from ...
- 8,784
3
votes
How are germ cells not reduced in number?
"How are germ cells not reduced in number?"
It does happen. Germ cells do eventually run out. It is called menopause in women. And age related infertility in men.
As for your question of where do ...
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3
votes
Accepted
During interphase, is DNA wrapped around histones?
Yes, DNA is always wrapped around histones.
DNA condensation using histones is not only meant to form the chromatids for mitosis/meiosis, but also one of the factors that control gene expression. ...
- 2,106
2
votes
Accepted
Formula for number of divisions required to form x number of cells (Mitosis and Meiosis)
For a male, one primary spermatocyte produces two secondary spermatocytes through meiosis I, which in turn produce two spermatids each through meiosis II. So one primary spermatocyte produces four ...
- 268
2
votes
Can a cell start a mitosis if it lacks energy or molecules to complete it?
The short answer: no. First, let's get an understanding of the cell cycle control system, as there are some important molecules involved in this system that regulate mitosis. Think of the control ...
2
votes
What are golgi blobs?
What are golgi?
Stacked array in the cisternae which are ought to connect vesicles and tubules
Made of >1000 different proteins
Has the ability to transform/alter in response to a cellular ...
- 2,603
2
votes
From 46 human chromosomes, is each one from a single parent?
Yes, each single chromosome came from one parent. However, it is not true that each chromosome came from one grandparent. Due to crossing over in meiosis, the copy of Chr 1 that you got from your ...
- 5,175
2
votes
Why do some organelle (like ER and Golgi complex) cannot be seen under microscope during cell division?
A cell when undergoes the process of cell division there are structures known as spindle fibres that are required to pull the chromosomes off to the poles of the cell so that it can be segregated into ...
- 126
2
votes
Accepted
Purpose of intensive protein synthesis in G1 phase of mitosis
The G1 phase of eukaryotic cell cycle is part of interphase, which is when the cell is replicating its DNA ready for division. To understand the need for intense protein synthesis, we first need to ...
- 213
2
votes
Accepted
Mitosis and Colchicine
The question is asking which is NOT true. You are correct that C is true - very few cells should be found in anaphase or telophase.
D is also true. When spindle fibres are dissolved, chromosomes/...
- 326
2
votes
How does gene affect organs development in eukaryotic cells?
The question is very broad and I think can only be answered in very broad terms.
Proteins have metabolic functions. They do stuff! Their actions include catalyzing metabolic reactions, transporting ...
- 68k
2
votes
Accepted
With over 400 chromosomes, does mitosis in a species of butterfly happen in the same way as in humans?
Mitosis was displayed in a lot of organism, also in organism with a very high number of chromosomes. Here's an example of the analysis made in a fish with an average count of 280 chromosomes. Look at ...
- 406
2
votes
Accepted
Why is a cell in anaphase (without a nuclear envelope) be considered as a eukaryotic cell?
It is still considered a Eukaryotic cell because the daughter cells and mother cell are both Eukaryotic; the chromosomes will condense and be contained in a Nucleus after Telophase and Cytokinesis. ...
- 46
1
vote
Is aneuploidy/aneusomy only a problem for cell division?
I just want to understand WHY brain cells .... are okay with aneuploidy
Great question. The standard hypothesis has been that aneuploidy confers some kind of advantage to the function of the organ (...
- 1,597
1
vote
What is the purpose of two cell divisions in meiosis?
For developing a 2N cell, we need a N cell from each parent. In any division(meiosos or meitosis), chromosomes are doubled at first. In firs meiosis a 2N cell in divided into two N cells and as you ...
- 73
1
vote
Reproduction or Cell division
Both cells from unicellular organisms (for example, E. coli) and multicellular ones (humans, for example) divide by mitosis - you are correct. The daughter cells are not just very genetically similar, ...
- 15.2k
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