Abdul Archive
In 1902, the basic principles of genetics, which Archibald Garrod successfully applied to the inheritance of alkaptonuria, had just become widely known among biologists. Surprisingly, these principles had been discovered some 35 years earlier by Johann Gregor Mendel (1822 – …
Although the science of genetics is young — almost entirely a product of the past 100 years — people have been using genetic principles for thousands of years. Prehistory: The first evidence that humans understood and applied the principles of …
Although the science of genetics is relatively new, people have understood the hereditary nature of traits and have “practiced” genetics for thousands of years. The rise of agriculture began when humans started to apply genetic principles to the domestication of …
On August 12, 1904, Tsar Nicholas Romanov II of Russia wrote in his diary: “A great never-to-be forgotten day when the mercy of God has visited us so clearly.” That day Alexis, Nicholas’s first son and heir to the Russian …
Importance of the Plant Diseases Globally, enormous losses of the crops are caused by the plant diseases. The loss can occur from the time of seed sowing in the field to harvesting and storage. Important historical evidences of plant disease …
Citrus canker is one of the most feared of citrus diseases, affecting all types of important citrus crops. The disease causes extensive damage to citrus and severity of this infection varies with different species and varieties and the prevailing climatic …
The transverse septa which divide both monokaryotic and dikaryotic hyphae into segments are incomplete; they contain a central pore which permits cytoplasmic continuity between adjacent segments. The septal pore is surrounded by a barrel-shaped flange of thickened wall material. Such …
Occurence: Puccinia includes about 700 species which are important as they cause rust dieseases of economically important crop plants such as wheat,barley, eats etc. The most important of all is P. graminis. It is an internal obligate parsite and is found …
Occurrence: Chara is a fresh water, green alga found submerged in shallow water ponds, tanks, lakes and slow running water. C. baltica is found growing is brackish water and C. fragilis is found in hot springs. Chara is found mostly …
Following types of life histories are found in algae: (a) Haplontic Monophasic: It is a primitive life cycle. In this case, vegetative plant body remains haploid. Gametes are produced by mitosis and fuse to form diploid zygote. First division in …