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Mutations and genetic recombination (in sexually reproducing organisms) are major sources of variations in natural populations, In this section we will briefly mention the various types of mutations, their rates and how they are caused.
The term mutation is used to designate the process by which changes arise in the genetic material and, the end products of such processes. Mritations form a separate category of sources of variability, distinct' from variability arising from genetic recombination or independent assortment of chromosomes, characteristic of sexually reproducing individuals. There are two categories of mutations. '(1) Chromosomal mutations which affect the'number of chromosomes and the number or the arrangement of gencs in a chromosome; (2) gene mutations which affect only one or a few nucleotides in a gcne. We shall now tiiscuss these two aspects of mutaion.
Explain about the Electrophoresis? Electrophoresis refers to the movement of charged particles because of an external electric field. Because charged molecules can be made to m
In the above sections we discussed in detail the fossil record of primates in general and more particularly those of apes and the humans. Despite the fact that in recent years a nu
P a ck a g i n g of Meat Products Meat needs to be packaged to prevent contamination, color deterioration, loss of moisture, odor pickup, oxidative rancidity etc and pro
E s o pha g e a l obstruction It is also known as choke. It may be acute or chronic and is characterized by inability to swallow, regurgitation and bloat. E t
Vitamin E (DL-α-Tocopherol) DL-α-Tocopherol is a yellow to red-brown, clear, viscous oil almost without odour which decolourise when exposed to light and air. DL-α-Tocopherol
Subsequently many such fossils were known from France, Italy and middle East. All such fossils exhibited reduced brow ridges, steep forehead, high rounded cranial vault, short face
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Corpus Allatum and Prothoracic Gland Corpus Allatum The corpus allatum is situated in the neck region of insects. It is generally a rounded, solid and translucent struc
Define about the Ishihara's Plates of eyes Ishihara's Plates: Following plates are available- Transformation, Vanishing, Hidden Digit and Diagnostic plates. 1) The plates ar
Clinical symptoms of HIV Generally, a person infected with HIV does not show any apparent symptoms for a number (3 to 12) of years. Ten to fifteen percent infected people may,
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