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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.
What is the Mendel's second law? The Mendel's second law postulates that two or more different traits are also conditioned by two or more pair of different factors that every i
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On the overall process of cell-to-cell communication within the nervous system, what role does the Ca2+ play in the synapse? A) contributes in the biosynthesis of acetylcholine B)
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Whenever a chromosome is replicated the replication machinery passes by the nucleosomes without deleting the histones from the DNA. How this happens is since not fully understood.
Define Physiology: Cohesion & Adhesion Theory? Transport in Plants : Transport of water, minerals and nutrients within vascular plants is dramatically different from animals
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