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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.
organism that have wide tolerance range
What is the importance of the uterine glycogen-producing glands? The uterine glands produce glycogen that can be degraded into glucose to nourish the embryo before the complete
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how they are joints to each other
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Intravenous Route This route of administering drugs is becoming more popular in the paediatric practice. Purpose of this Route When rapid action is required.
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different type of respiration in animals
CRITICISM OF DARWINISM - Arriva l of the fittest: Darwinism explains the survival of the fittest but was unable to account for the arrival of the fittest. V estigia
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