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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.
Endosperm with micropylar Haustorium A very prominent and aggressive micropylar haustorium is seen in Impatiens. Here the division of the primary endosperm nucleus is followed
Define Methods for Studying the Nutrient Requirements? 1) Population survey of nutrient intakes of healthy individuals is one method of estimating nutrient requirements. The av
Types of Mechanism - Stress Condition Plants have evolved a variety of mechanisms to withstand stress conditions. In many cases we can precisely define the way plants enable t
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What are cells with a delimited nucleus called ? What are the main elements of the nucleus? Cells with delimited nucleus are known as eukaryotic cells. Organisms composed of on
Q Are there non-parasitic viruses? All viruses are necessitating intracellular parasites that are they depend on the host cell to complete their life cycle. A virus does not ha
Stratification of Vegetation - Qualitative Characters Stratification of vegetation is another important feature of plant communities. There are different vertical strata in di
Pigs Mycoplasma infection causes arthritis in limb joints in pigs, while infection with M. hyopneumoniae gave rise to symptoms of coughing and chronic pneumonia and the disease
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What is the evolutionary importance of pteridophytes? As the first tracheophytes, pteridophytes were also the first plants to extensively colonize the terrestrial environment f
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