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Apparently. The untwisting, unzipping. Rezipping and retwisting occur sequentially and ensure that each newly formed double helix is exactly like other one. The final result is a pair of sister chromatids. Each chromatid attaches to its other copy, or sister, at a point of constriction called centromere. The centromere is a specific DNA sequence of about 220nucleotides and has a specific location on any given chromosome. Bound to each centromere is a disk of protein called a Kinetochore, which eventually is an attachment site for the microtubules of the mitotic spindle. As the cell cycle moves into the G2 phase, however, the chromosomes begin condensation. During condensation each sister Chromatid becomes coiled super coiled into a very tightly compacted structure, which can now be seen with the light microscope and is called a chromosome. During the G2phase, the cell also begins to assemble the structure that it will later use to move the chromosomes to opposite poles of the cell.
Polygonum Type - Monosporic Embryo Sacs The embryo sac is formed from the chalazal megaspore in the tetrad and is eight-nucleate. The development of the embryo sac begins with
Q. What is the difference between translation and transcription? Transcription is the name given to the formation of DNA molecules from an open DNA chain used as a template, Tr
What is a recessive gene? With the birth of a child, it gets its genes from both parents. Some genes 'override' other genes. Using hair color as instance: If single parent i
Q. How can the knowledge about fermentation describe the origin of muscle cramps and pains after intense physical exertion? A typical fermentation process due to oxygen scarcit
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What is the significance of Pharyngeal gill slit ? Lateral opening in the wall of the pharynx which allows water to enter into the mouth and exit through the pharynx. This is on
BLOOD SAMPLING : In blood sampling, the skin is deliberately punctured in order to take a blood sample for analysis. If this is done carelessly, it is easy for microorganisms eith
Glucose-6-phosphate to Glucose Glucose-6-phosphate to Glucose : Glucose-6-phosphate is converted to glucose by glucose-6-phosphatase which is present in intestine, liver and
How different are gymnosperms from bryophytes and pteridophytes? Gymnosperms are not cryptogamic as bryophytes and pteridophytes are. They are phanerogamic and so they form flo
What is the generic function of leukocytes? What are leukocytosis and leukopenia? The generic function of leukocytes is to contribute in the defense of the body against strange
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