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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.
Explain about the Adequate Intake (AI)? If sufficient data are not available to establish an EAR and hence RDA, the AI is derived instead. The AI is derived from observations o
How are mutagenic agents related to cancer incidence in a population? Is cancer a disease transmitted to the individual offspring? The exposition of a population to mutagenic a
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Long-hair in cats is due to a recessive long allele, l. Black cats are due to a recessive agouti allele, a. A short-haired tabby cat is crossed to a long-haired tabby cat, and they
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Describe the respiratory organ in pila
3 benefits humans get from coral
Q. Define the Ionizing radiation for sterilization? Ionizing radiation are high energy electromagnetic waves including X-rays, gamma rays, particulate radiation, cosmic rays wh
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