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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.
Mitral valve prolapse (MVP) has emerged as a prominent, predisposing structural cardiac abnormality and in adults accounts for 7 to 30 per cent of NVE in cases not related to drug
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Q In which environments bacteria live? Bacteria can be found in a variety of environments throughout the planet. There are bacteria in the air, on the surface, in fresh water,
Explain the Composition of MacConkey Agar? Bactopeptone - 17.0 gm Protease Peptone - 3.0 gm Lactose - 10.0 gm Bile salt mixture - 1.5 gm Sodium chloride - 5.0 gm
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Situation in which a closed loop negative feedback system is converted to an open loop system? A. A disease that destroys all the adenylyl cyclase and all the cAMP in the
C h r on i c respiratory disease (CRD) Infection with Mycoplasma gallisepticum is characterized by slow onset; CRD is seen in chickens, turkeys, and other birds. Ducks f
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Importance of Research in Nursing: It is the responsibility of the nursing profession to discover, verify, structure and restructure the professional knowledge through syst
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