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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.
Lipids Lipids are oily or greasy organic compound forming about 3% of protoplasm. These are also compound of carbon hydrogen and oxygen but unlike carbohydrates. The hydrogen a
HIND BRAIN - 1 . CEREBELLUM - Little part, lies below the posterior part of cerebrum & above the medulla oblongeta. It conists of median lobe vermis & 2 lat
Ecological adaptation in animals to aquatic environment In the aquatic environment animals are confronted with the problem of excess water. Freshwater and marine animals try to
Define Role of Buffer in Electrophoresis? Buffer ions have a two-fold purpose in electrophoresis, they carry the applied current, and they fix the pH at which electrophoresis i
Q. Show the Regulation of blood pressure? Nervous System control of BP Maintains primarily an adequate systemic BP, and alters blood distribution in body to meet specific fu
what does the sperm cell fuses with?
Tetrasporic Embryo Sacs In this group neither of the meiotic divisions is accompanied by wall formation so that at the end of meiosis all the four haploid nuclei remain in a
Define Rhizoids - Types of Hyphae? Rhizoids - These are brown slender root like structures which arise in cluster from each node of the stolon. These penetrate the substratum
Cnidaria and Platyhelminthes - Larval forms Cnidaria The common larval stage that is found in cnidarians is the planula which forms following gastrulation. The planula is
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