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Study of meiosis in onion flower bud with the help of permanent slides

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  Practical Notebook Biology Standard XII Biology  Answeres Practical Notebook Standard XII Class-12th science Click here download in PDF https://drive.google.com/file/d/10NrtEg6k0Hh8ttkenvZvI2EzFqZN8vPr/view?usp=sharing 7. Study of meiosis in onion flower bud with the help of permanent slides.  Aim:  To study and identify different stages of meiosis.  Principle 1 Meiosis is a special type of cell division that occurs in the diploid reproductive or germ tissue (cells).  It is a reduction division that results in the formation of four haploid daughter cells each receiving half of the total number of chromosomes than those present in the mother cell from which it is produced Observation For the preparation of meiosis slides, generally, anther of Lily or Onion is used.  Meiosis can be studied with the help of stained permanent slides of T. S. of the anther.  Permanent slides should be observed under the high power of a compound microscope.  Meio...

Isolation of DNA from Given Sample

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  Practical Notebook Biology Standard XII Biology  Answeres Practical Notebook Standard XII Class-12th science Click here download in PDF 9. Isolation of DNA from Given Sample  Aim:  To extract and isolate DNA from a fruit sample.   Requirements: -  Fleshy berry fruits like banana, Zizyphus, grapes, etc, can be used.  Fleshy fruits of banana, liquid soap, distilled water, salt (NaCl), 1000 ml ice-cold isopropyl alcohol i.e.  IPA (Chill the alcohol (IPA) by placing the test tube in a beaker containing ice cubes and some water] measuring spoons, glass stirring rod, test tubes, glass beakers, plastic cups, strainer or coffee filter, funnel, etc. Principle:  All plants' DNA extraction protocols comprise the basic steps of disruption of a cell wall, cell membrane, and nuclear membrane to release the DNA into solution followed by precipitation of DNA and ensuring removal of the contaminating biomolecules.  A figure is separated by physic...

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