VIDEO TUTORIAL ON FRUITS

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GENETIC ENGINEERING

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GENETIC ENGINEERING What is genetic engineering ? It is about the tools & technologies of molecular biology for cleaving & rejoining DNA SEQUENCES from two or more different organisms. These genetically modified DNA fragments are called as RECOMBINANT DNA molecules. APPLICATIONS OF GENETIC ENGINEERING 1. These can be cloned & amplified virtually to unlimited extent. 2. Application of DNA manipulation ranges from cloning genes to cloning organisms including  transgenic microbes,important crops & farm animals. 3. We can get modified food products, human gene products, medical products. 4. Hereditary diseases can be cured. 5. In forensic investigations.  DNA FINGERPRINTING  is a reliable technique for forensic investigation. Therefore GENETIC ENGINEERING is a kind of BIOTECHNOLOGY , alteration of genetic make up of cells by artificial means.                   ...
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BIOLOGY LECTURE ON CELL DIVISION(MITOSIS AND MEIOSIS)

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CELL DIVISION  CELL CYCLE- When cell divides.It synthesise its components including genetic material in duplicate. After division This passes to DAUGHTER CELLS. Sequence of events by which cell duplicate its contents & divides into two called CELL CYCLE. IMPORTANCE IN EUKARYOTES- From single cell trillions of cells develop.Rate & no. officer division vary.In adult tissues like bone marrow division is continuous.In fully formed organism less division occurs. CELL CYCLE  It Has two periods: 1- INTERPHASE : - Period of rest or RESTING STAGE .Preparatory phase for cell division. 2- MITOSIS : -  Three processes occurs during this phase: REPLICATION OF DNA & SYNTHESIS OF PROTEINS AS HISTONES. IN ANIMALS-DUPLICATION OF CENTRIOLE -Two daughter centrioles formed at right angle to each other. SYNTHESIS OF ENERGY RICH COMPOUNDS -Provides energy for mitosis & synthesis of proteins MITOSIS  IT...
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BIOLOGY LECTURE ON NUCLEIC ACIDS

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 NUCLEIC ACIDS  [DNA &RNA] There are chromosomes in the nucleus of cell,which are thread like.They are visible only during cell division.Chromosomes are uncoiled in loose network called chromatin contains DNA,RNA,& PROTEINS.                                  DNA means DEOXYRIBONUCLEIC ACID  RNA means RIBONUCLEIC ACID. DNA & RNA both are information storage devices of cell.These are two kinds of nucleic acids. DNA: It has special coded genetic programme with detailed & specific instructions for each organism heredity.[one gene one character passed to offspring]. Its model was proposed by WATSON & CRICK In 1953. It consists of linear polymers of repeating monomer subunits called nucleotides. Each nucleotide contains A PENTOSE SUGAR,A PHOSPHATE GROUP,NITROGENOUS BASE[PURINE or PYRIMIDINE] A ,G ,C,T SUGAR RIBOSE in RNA ...
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