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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.
B o tu l i s m It is a toxicity in chickens, turkeys, ducks and other aquatic birds caused by a bacterial toxin produced by anaerobic bacteria Clostridium botulinum mai
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Define Supplementary feeding to control under nutrition? Supplementary feeding has remained an important component to control under nutrition. Considering the dietary inadequac
Anther is the top of a stamen's filament; divided into pollen sacs in which the pollen grains are form.
Define the Energy requirement to avoid Underweight problem? The total calorie intake should be 500 to 1000 Kcal in excess of the daily needs in order to result a gain in weight
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Gorgonids yield chemicals like prostaglandins, medically useful for birth control, prevention of peptic ulcers, treatment of asthma, regulation of blood pressure, etc. Sponges are
A vertical section of an ovule is shown below. The correct ploidy levels of the four structures P, Q, R and S respectively are: a. n, 2n, n, n b. 2n, n, n, n c.
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