Canadian and British researchers have discovered that chromosomes play an active role in animal cell division. This occurs at a precise stage ..... cytokinesis.It is well known that microscopic cable-like structures, called microtubules, were involved in pulling chromosomes to opposite poles of the cell during the division process. At this time, microtubules physically separate the chromosomes via their centromere while other microtubules signal to the cell where its equator is, i.e., where division will take place, one scientist explained. Until now, it was believed that the chromosomes only played a passive role:that they were pulled by the microtubules and didnt affect cytokinesis, but this is not the case. We now know that the chromosomes themselves also play an active role in the cell entering cytokinesis.Considering the information above which of the following statements would be true if there was a mutation in chromosome that altered its ability to actively regulate cytokinesis?

THE CELL CYCLE

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Canadian and British researchers have discovered that chromosomes play an active role in animal cell division. This occurs at a precise stage ____ cytokinesis.It is well known that microscopic cable-like structures, called microtubules, were involved in pulling chromosomes to opposite poles of the cell during the division process. “At this time, microtubules physically separate the chromosomes via their centromere while other microtubules signal to the cell where its equator is, i.e., where division will take place, “ one scientist explained. Until now, it was believed that the chromosomes only played a passive role:that they were pulled by the microtubules and didn’t affect cytokinesis, but this is not the case. We now know that the chromosomes themselves also play an active role in the cell entering cytokinesis.Considering the information above which of the following statements would be true if there was a mutation in chromosome that altered its ability to actively regulate cytokinesis?

A	The cell will not have a nuclear membrane so one daughter cell will be mutated.
B	The cell will not be able to divide its cytoplasm and other organelles into two separate daughter cells.
C	The cell will be left unable to replicate its DNA, this will result in the cell dividing uncontrollably creating cancerous tumors.
D	The cell will be vulnerable to genetic mutations, this will leave the next generation of daughter cells without any genetic variation.

Explanation:

Detailed explanation-1: -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.

Detailed explanation-2: -The form of cell division known as mitosis is responsible for the body’s expansion and repair. Gametes are created as a result of the cell division process known as meiosis.

Detailed explanation-3: -Gregor Mendel’s Courage and Persistence Our modern understanding of how traits may be inherited through generations comes from the principles proposed by Gregor Mendel in 1865.

Detailed explanation-4: -The chromosome was first discovered by Walther Flemming. He named the thread-like structure that is present in the nucleus as chromatin in 1878. Karl Nageli observed the rod shape of chromosomes in the plant cell in 1842 and called them transitory cytoblasts, which were later identified as chromosomes.

There is 1 question to complete.

AP BIOLOGY

CELL DIVISION

THE CELL CYCLE