A cell division
under microscope was first discovered by German botanist Hugo von Mohl in 1835 as he worked over the green alga Cladophora glomerata
. In 1943, cell division was filmed for the first time by Kurt Michel using a phase-contrast microscope.
Who observed the first cell division?
Walter Flemming
described chromosome behavior during animal cell division. Flemming was one of the first cytologists and the first to detail how chromosomes move during mitosis, or cell division.
How do we observe the cell cycle?
Who observed first the meiosis cell division?
Meiosis was discovered and described for the first time in sea urchin eggs in 1876 by the German biologist
Oscar Hertwig
. It was described again in 1883, at the level of chromosomes, by the Belgian zoologist Edouard Van Beneden, in Ascaris roundworm eggs.
How would you describe the importance of cell division as part of cell cycle?
Cell division is fundamental to all living organisms and required for growth and development. As an essential means of reproduction for all living things, cell division
allows organisms to transfer their genetic material to their offspring
.
How do you think cell division is involved in the reproduction of eukaryotes such as humans?
Meiosis occurs in human sperm and egg production in which four haploid sex cells are produced from a single parent precursor cell
. In both mitosis and meiosis of nucleated cells, shuffling of chromosomes creates genetic variation in the new daughter cells.
When was mitosis first described?
In
1873
, the German zoologist Otto Bütschli published data from observations on nematodes. A few years later, he discovered and described mitosis based on those observations. The term “mitosis”, coined by Walther Flemming in 1882, is derived from the Greek word μίτος (mitos, “warp thread”).
Who observed one cell dividing into two which led to another tenet of the cell theory?
Credit for developing cell theory is usually given to three scientists:
Theodor Schwann
, Matthias Jakob Schleiden, and Rudolf Virchow. In 1839, Schwann and Schleiden suggested that cells were the basic unit of life. Their theory accepted the first two tenets of modern cell theory (see next section, below).
What are the different stages in mitosis that you were able to observe?
There are 5 different stages of mitosis that can be observed namely;
interphase, prophase, metaphase, anaphase and telophase
. By using certain chemicals to stain the cells, most of the cells can be observed under different stages of mitosis.
How do you monitor cell division?
Flow cytometry
can be used to monitor the extent of cell division by: 1) staining cells with bright, stable, non-toxic fluorescent dyes that label bulk cell proteins or membranes; and 2) following the decrease in intensity (dye dilution) as the dyes are partitioned between daughter cells at each successive mitosis [6,7 …
What did Walther Flemming do?
Walther Flemming was a
pioneer of cytogenetics
, a field of science that analyses structures and processes in the cell nucleus under a microscope. He was the first person to conduct a systematic study of chromosomes during division and called this process mitosis.
Is cell division part of the cell cycle?
A cell cycle is a series of events that takes place in a cell as it grows and divides.
A cell spends most of its time in what is called interphase, and during this time it grows, replicates its chromosomes, and prepares for cell division
. The cell then leaves interphase, undergoes mitosis, and completes its division.
During what phase do chromosomes first become visible?
Metaphase
is a stage in the cell cycle where all the genetic material is condensing into chromosomes. These chromosomes then become visible. During this stage, the nucleus disappears and the chromosomes appear in the cytoplasm of the cell.
What are the 4 stages of the cell cycle?
In eukaryotes, the cell cycle consists of four discrete phases:
G
1
, S, G
2
, and M
. The S or synthesis phase is when DNA replication occurs, and the M or mitosis phase is when the cell actually divides. The other two phases — G
1
and G
2
, the so-called gap phases — are less dramatic but equally important.
How is meiosis responsible for introducing variation in nature?
Genetic variation is increased by meiosis
Because of
recombination and independent assortment
in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote. Recombination or crossing over occurs during prophase I.
Why is cell division seen as critically important in the life cycle of all organisms?
Cell division plays an important role in all living organisms, as
it is essential for growth, repair and reproduction
. This process helps in: Renewing of damaged cells. Production of new cells from older ones.
Why is cell division important Identify at least 3 reasons?
Cell division is necessary
for the growth of organisms, repair of damaged tissues, healing and regeneration, and reproduction
.
What is the importance of cell division in the propagation of a species?
Cell division
serves as a means of reproduction in unicellular organisms through binary fission
. In multicellular organisms, cell division aids in the formation of gametes, which are cells that combine with others to form sexually produced offspring.
Do you think that cell division is only exclusive to eukaryotes?
Cell division is simpler in prokaryotes than eukaryotes
because prokaryotic cells themselves are simpler. Prokaryotic cells have a single circular chromosome, no nucleus, and few other cell structures. Eukaryotic cells, in contrast, have multiple chromosomes contained within a nucleus, and many other organelles.
How is the process of cell division in prokaryotes different from cell division in eukaryotes?
The main difference between prokaryotic and eukaryotic cell division is that
the prokaryotic cell division occurs through binary fission whereas the eukaryotic cell division occurs either through mitosis or meiosis
. Furthermore, prokaryotic cells lack a nucleus while eukaryotic cells have a nucleus.
How is cell division similar within prokaryotes and eukaryotes?
Unlike eukaryotes, prokaryotes (which include bacteria) undergo a type of cell division known as binary fission. In some respects, this process is similar to mitosis;
it requires replication of the cell’s chromosomes, segregation of the copied DNA, and splitting of the parent cell’s cytoplasm
.
What was discovered first mitosis or meiosis?
The two processes were discovered by different scientists.
Meiosis was discovered by German biologist Oscar Hertwig while German physician Walther Flemming is credited with the discovery of mitosis
.
Who observed the division of chromosomes in 1897 and published a superb description of mitosis?
He was the first to observe and describe systematically the behaviour of chromosomes in the cell nucleus during normal cell division (mitosis). After serving as a military physician during the Franco-German War,
Flemming
held positions at the University of Prague (1873–76) and at the University of Kiel (1876–1901).
Did Walther Flemming have a wife?
Walther Flemming (21 April 1843 – 4 August 1905) was a German biologist and a founder of cytogenetics. He was born in Sachsenberg (now part of Schwerin) as the fifth child and only son of the psychiatrist Carl Friedrich Flemming (1799–1880) and his second wife,
Auguste Winter
.
What did Matthias Schleiden observe?
Matthias Jacob Schleiden studied microscopic plant structures. In his studies, he observed that
the different parts of the plant organism are composed of cells or derivatives of cells
.
Who discovered cell for the first time what procedure did he follow?
Answer: The cell was first discovered by
Robert Hooke
in 1665, which can be found to be described in his book Micrographia. In this book, he gave 60 ‘observations’ in detail of various objects under a coarse, compound microscope. One observation was from very thin slices of bottle cork.
Who was the first person to see cells under the microscope and give them a name?
The first person to observe cells was
Robert Hooke
. Hooke was an English scientist. He used a compound microscope to look at thin slices of cork.
