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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.
Q. What is meant by the peripheral nervous system (PNS)? The peripheral nervous system comprehends the ganglia and nerves of the body.
D-glucose differs from D-galactose only in the arrangement around carbon 4. Therefore D-glucose and D-galactose are- Select one: a. enantiomers b. epimers c. mirror ima
Q. What is the difference between lungs and gills? Lungs and Gills are richly vascularized organs that serve for gas exchange between the environment and the circulatory system
Q. Etiological factor of diverticular disease? The causes of diverticular disease are not certain, but several factors may contribute to changes in the wall of the colon. These
discuss the importance of protozoa to humans
For animals, what is the advantage of internal fertilization and what type of species utilize it?
Q. Which respiratory adaptations or organs do aquatic and terrestrial arthropods respectively present? In crustaceans, typical aquatic beings, there are richly vascularized gil
Q. Proteins requirement in diabetes? Proteins: Proteins should be provided in adequate amounts to maintain a normal body composition and prevent depletion of lean tissue mass.
NEUROGLI A CELLS (Rudolf Virchow, 1846) - Occurs in the C.N.S. The cells are less than neurons. Neuroglia cells are of four types - (i) Oligodendrocytes - Occ
What are multiple alleles? Is there dominance in multiple alleles? Multiple alleles is the phenomenon in which the similar gene has more than two dissimilar alleles (in normal
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