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Sara would like to film the movement of chromosomes during cell division Her best choice for a microscope would be a?
Wiki User
∙ 12y ago
light microscope, because the specimen is alive
Wiki User
∙ 12y ago
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Which choice represents a dihybrid cross?
two sets of genes on nonhomologous chromosomes
What is the most common type of question use on the PSAT?
Multiple-choice
Who are all Cytologists and their contribution?
Visual discovery of chromosomes. Textbooks have often said that chromosomes were first observed in plant cells by a Swiss botanist named Karl Wilhelm von Nägeli in 1842.[1] However, this opinion has been challenged, perhaps decisively, by Henry Harris, who has freshly reviewed the primary literature.[2] In his opinion the claim of Nägeli to have seen spore mother cells divide is mistaken, as are some of his interpretations. Harris considers other candidates, especially Wilhelm Hofmeister, whose publications in 1848-9 include plates which definitely show mitotic events.[3][4] Hofmeister was also the choice of Cyril Darlington. The work of other cytologists such as Walther Flemming, Eduard Strasburger, Otto Bütschli, Oskar Hertwig and Carl Rabl should definitely be acknowledged. The use of basophilic aniline dyes was a new technique for effectively staining the chromatin material in the nucleus. Their behavior in animal (salamander) cells was later described in detail by Walther Flemming, who in 1882 "provided a superb summary of the state of the field".[5][6] The name chromosome was invented in 1888 by Heinrich von Waldeyer. However, van Beneden's monograph of 1883 on the fertilised eggs of the parasitic roundworm Ascaris megalocephala was the outstanding work of this period.[7] His conclusions are classic: * Thus there is no fusion between the male chromatin and the female chromatin at any stage of division... * The elements of male origin and those of female origin are never fused together in a cleavage nucleus, and perhaps they remain distinct in all the nuclei derived from them. [tranl: Harris p162] "It is not easy to identify who first discerned chromosomes during mitosis, but there is no doubt that those who first saw them had no idea of their significance... [but] with the work of Balbiani and van Beneden we move away from... the mechanism of cell division to a precise delineation of chromosomes and what they do during the division of the cell." [8] Van Beneden's master work was closely followed by that of Carl Rabl, who reached similar conclusions. [9] This more or less concludes the first period, in which chromosomes were visually sighted, and the morphological stages of mitosis were described. Coleman also gives a useful review of these discoveries.[10] Nucleus as the seat of heredity. The origin of this epoch-making idea lies in a few sentences tucked away in Ernst Haeckel's Generelle Morphologie of 1866.[11] The evidence for this insight gradually acumulated until, after twenty or so years, two of the greatest in a line of great German scientists spelt it out. August Weismann proposed that the germ line was separate from the soma, and that the cell nucleus was the repository of the hereditary material, which he proposed was arranged along the chromosomes in a linear manner. Furthermore, he proposed that at fertilisation a new combination of chromosomes (and their hereditary material) would be formed. This was the explanation for the reduction division of meiosis (first described by van Beneden). Chromosomes as vectors of heredity. In a series of outstanding experiments, Theodor Boveri gave the definitive demonstration that chromosomes were the vectors of heredity. His two principles were: : The continuity of chromosomes : The individuality of chromosomes. It was the second of these principles which was so original. He was able to test the proposal put forward by Wilhelm Roux, that each chromosome carries a different genetic load, and showed that Roux was right. Upon the rediscovery of Mendel, Boveri was able to point out the connection between the rules of inheritance and the behaviour of the chromosomes. It is interesting to see that Boveri influenced two generations of American cytologists: Edmund Beecher Wilson, Walter Sutton and Theophilus Painter were all influenced by Boveri (Wilson and Painter actually worked with him). In his famous textbook The Cell, Wilson linked Boveri and Sutton together by the Boveri-Sutton theory. Mayr remarks that the theory was hotly contested by some famous geneticists: William Bateson, Wilhelm Johannsen, Richard Goldschmidt and T.H. Morgan, all of a rather dogmatic turn of mind. Eventually complete proof came from chromosome maps - in Morgan's own lab! [12]
What is the difference between choice and selection?
A choice is what you make from an available selection. A selection defines available choices.
What are the steps in mitotic cell division?
Mitosis can be divided into 5 phases: Prophase Prometaphase Metaphase Anaphase Telophase Cytokinesis is the division of the two cells after mitosis, so strictly speaking it is not a step of mitosis.
What is gender division?
gender division is the division among people on the basis of race, sex, birth, rich, poor and even on the choice of the people.
Who was the founder of the Pro-Choice Movement?
The founder of the Pro-Choice Movement is often attributed to various activists, organizations, and court cases that have advocated for reproductive rights and access to safe and legal abortion. Some key figures in the movement include Margaret Sanger, Roe v. Wade plaintiff Norma McCorvey, and organizations like Planned Parenthood.
Which type of microscope would be the best tool to use to view the surface of a bacterial cell And why?
A scanning electron microscope would be the best choice because the electron microscope can achieve a much greater resolution than that obtained with the light microscope because the wavelength of electrons is shorter than that of light.
What are the personal reasons of pro-choice movement?
Caring about women.
What is my latitude?
The angular distance you are from the equator or the amount of freedom of movement or choice you have.
Who won the intermediate division of young reader choice award in 2003?
Kanye west won
Is a multiple choice type of test valid to determine learning of manipulative skills like focusing a microscope?
Some believe multiple choice tests are valid when determining manipulative skills and others disagree. Here are some opinions:Yes, the teacher can determine that the learner is already capable of doing the hands on of microscope through assessing her/his cognitive outcome, with the use of assessment tool like multiple choice.No. the skill of focusing should be observed. If you asked about which part of the microscope would be used to focus the microscope, that would be valid.
Is a multiple choice type of test valid to determine learning of manipulative skill like focusing a microscope?
A multiple-choice test may not be the most valid method for assessing the learning of hands-on manipulative skills like focusing a microscope. A more appropriate assessment method would involve practical demonstrations or performance-based assessments where students actually show their ability to focus a microscope in a real-world setting.
Is a multiple choice type of test to determine learning of manipulative skill like focusing a microscope?
Multiple choice tests are not considered to determine learning of a manipulative skill. The correct answer could be chosen by guessing and not by skill.
Which expressions allows for the use of the power division formula in order for it to be simplified?
We can't answer multiple choice questions without the choices.
What happens if you don't wear an automatic movement watch often?
Keep it in a watch winder is the best choice!
What has the author Gary Crum written?
Gary Crum has written: 'Abortion' -- subject(s): Abortion, Pro-choice movement, Pro-life movement, Social aspects of Abortion
