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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.
Are the phloem and the xylem made of living cells? The cells of phloem are living cells and the cells that constitute the xylem ducts are dead cells killed by the lignin deposi
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Assessment of Development in Children The development of a child is studied through various responses which he exhibits following a natural or experimental stimulus. Basical
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Infectious canine hepatitis The disease is caused by type-1 canine Adenovirus in the family Adenoviridae. The disease appears in pups as peracute, acute, and mild. The clinica
what is an autotroph?
LOCOMOTION IN EARTHWORM - By contrection & relaxation of muscles waves are formed in body, generally from posterior to anterior. Setae are helpfull in locomotion. Rate of lo
Determination of Erythrocyte Transketolase (ETK) Activity? The enzyme transketolase requires TPP for its activity, for the metabolism of pentose phosphate sugars as described u
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