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Sympatric speciation can be regarded as speciation where parent species gives rise to a daughter species without the individuals of a species being separated by space or territory. Both instantaneous and gradual models of sympatric speciation have been proposed. Barring one mode of instantaneous speciation by a mechanism known as polyploidy, other modes of sympatric speciation have remained quite controversial. Polyploidy is quite common among plants. (For a detailed discussion on polyploidy refer to Unit 10 of Block 2 of LSE-03 of Genetics course). A cross between two diploid plants could result in a tetraploid hybrid. The hybrid would remain largely reproductively isolated from its diploid parents. The reason for such isolation is that due to back-crossing if a triploid individual were to be formed, it will produce a high proportion of nonviable gametes. There is also a possibility that interbreeding between deploid and tetraploid forms or between different tetraploids may give rise to other polyploids.
Explain the Principle of Microscopy? When the light passes from one medium to another, refraction occurs, i.e., the ray is bent at the interface. The direction and the magnitud
Graphs are a way to convey information and trends in a convenient fashion. For this week's Discussion Board you should search the internet for a graph related to biology. Provide u
Cell - Cell is the structural & functional unit of life. Study of the structure of the cell is called cytology. Study of structure and functions of the cell is called
Q. What are a few diseases characterized by progressive loss of the axonal myelin sheath? Multiple sclerosis is a severe disease caused by progressive destruction of the myelin
Aeolian Wind transported materials constitute this category. This can be further divided into dunes or loess. Dunes are found in thr& types of situations. Fitly, these may occu
Alfieri Repair: This is advised for ischaenlic mitral regurgitation. In the area of prolapse, the anterior and posterior leaflet edges are approximated with one or two mattress
describe sds page for the proteins
Giemsa stain is a basic stain, thus the major chromagen is positively charged (cation). Why does this stain have an affinity for the bacteria cell wall, and for certain cellular co
Define Diagnostic Criteria for Anorexia Nervosa? Table gives the American Psychiatric Association diagnostic criteria for anorexia nervosa. Although the manual does not use bod
Single-cell organisms, protists, have always been a problem for taxonomists who have trouble describing categories for organisms. Their mixed feeding habits that include being capa
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