By Biman Basu
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Extra info for The DNA Saga ; 50 Years of the Double Helix
The chromatids separate at their centromeres and are pulled by the spindle fibers to the opposite poles of the cell. 117] at [07/18/16]. Copyright © McGraw-Hill Global Education Holdings, LLC. Not to be redistributed or modified in any way without permission. 18 • Telophase. The two sets of separated chromatids (two complete sets of chromosomes) assemble at the two poles of the cell, then begin to uncoil back into their string-like interphase condition. The spindle falls apart, the nuclear membrane reforms itself, and the cytoplasm divides (a process called cytokinesis).
Some of the fibers run from pole to pole, while others connect to the chromosomes at a dense granular body called the kintechore, located in the same region as the centromere. • Metaphase. During this phase, the spindle fibers are shortened or lengthened as required to move the chromosomes into a plane, usually near the center of the cell, called the metaphase plane. • Anaphase. The chromatids separate at their centromeres and are pulled by the spindle fibers to the opposite poles of the cell. 117] at [07/18/16].
D) celluloid. 117] at [07/18/16]. Copyright © McGraw-Hill Global Education Holdings, LLC. Not to be redistributed or modified in any way without permission. 22 DNA—The Chemical Basis of Heredity In 1869, just three years after Mendel’s paper was published, a Swiss chemist named Johann Friedrich Miescher made a discovery. When pure cell nuclei, obtained from pus cells collected from bandages discarded by hospital surgical wards, were treated with weakly alkaline solutions which were then neutralized by acids, an odd substance precipitated out.