risks of selective breeding

Crop improvement by deliberate attempt to cross two parents of desirable characters to incorporate such characters in next generations is called breeding. The entire process of pollination, fertilization and regeneration is kept under control and selected parents are allowed to ..

. Polyploidy may be caused by fertilization of an egg by more than one sperm failure of meiosis during gamete formation. Polyploidy can artificially be introduced by a chemical called colchicine or by crossing diploids with tetraploids. Although triploids exhibit sterility, polyploidy is useful in ..

Right from the early days of human civilization man has been breeding selected species that are useful to him. This has produced different varieties of plants and animals. The Result of Selective Breeding..

For breeding to start, the female should be 14-18 months and the male should be 2 yrs of age. For effective breeding it is important to select ewes and ram or goats that are best suited for local conditions. Different breeds are known for the quality of wool ..

Selection is an important technique in plant breeding. It involves picking the healthiest and the best ones out of the entire crop and reproducing them under controlled condition..

Selection of crops for rotation depends on soil condition, moisture condition, length of rainy season, type of inputs available (irrigation, fertiliser, pesticide, labour and machine power), risk involved, duration of crop (annual, biennial or perennial) and marketing and proce..

Controlling the disease or developing resistant varieties is time consuming and subject to variations in heritability of resistance over generations. But, disease free plants could be grown through the technique of tissue culture in a very short span of time overcoming the seasonal barriers withou..

Many technologies are generated out of intensive agricultural research, to increase the food production. They are grouped in three broad groups namely crop improvement, crop protection and crop production. There are three methods of crop improvement namely, selection, breeding a..

In parapatric speciation, the zones of two diverging populations are separate but do overlap. There is only partial separation afforded by geography, so individuals of each species may come in contact or cross the barrier from time to time, but reduced fitness of the heterozygote leads to sel..

Two parents of known well defined characters belonging to two different species within a genus are crossed to achieve heterosis. Some important hybrids (both inter specific and intra specific) are listed ..