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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.
Working of Specific Acquired Immunity Primary lymphoid organs, as you already know, are thymus and bone marrow. Secondary organs are lymph nodes, spleen and lymphoid tissue. Wh
Vitamin C (Ascorbic acid) Vitamin C, ascorbic acid is also called anti-scorbutic vitamin. Ascorbic acid occurs as white crystals or white crystalline powder without odour and o
What is the importance of water for enzymatic activity? Enzymes, biological catalysts, rely on water to reach their substrates and bind to them. There is no enzymatic activity
Q. What are the few examples of the control and informative function of organic molecules? Based on genetic information, organic molecules control the entire work of the cell.
These are areas where woody shrubs predominate rather then trees. In regions with a Mediterranean type of climate i .e., hot dry summers and cool wet winters, shrubs grow close tog
Stages of Research Process: Planning Stage The planning stage of research process includes a series of interdependent steps consisting of 1) conceptualizatioq of the r
What are the chemical elements that form most of living biological matter? The elements are:- a) oxygen (O), b) carbon (C), c) hydrogen (H) and d) Nitrogen (N).
Q. Aortic regurgitation by Cardiac Catheterization? Often cardiac catheterization is not indicated as reliable information for management decision making can be obtained throug
Q. How has the importance of the brain evolved from fishes to reptiles? From the least to the most complex brain structure, it is evident that the brain, from fishes to beings
Synthesis of Polyamine As the name of this class of compounds suggests, polyamines have several amino groups replacing hydrogen usually in alkyl chain e.g., putrescine is 1, 4
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