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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.
classification of excretory organs in helminthes, nermatodes, annelids, molluscs, arthropods and echinodems
Explain about Atrial Septal Defect (ASD) ? ASD occurs as an isolated anomaly in 5- 10 per cent of all CHDs. These communications occur in four sites i.e. in the central portion
What is Eutrophication in ecology explain briefly? Freshwater ecosystems demonstrate the close relationship between aquatic and terrestrial ecosystems. Until recently, most peo
Just definition
As coenzymes participate in a variety of functions, they can be classified broadly into two groups: i) Hydrogen transferring coenzymes, and ii) Group transferring coenzym
i hyalonema labled diagram with his genral characters and classification
Why do most of plants present opposite phyllotaxis? The Phyllotaxis is the way that leaves are arranged on shoots. Most of plants have opposite phyllotaxis that (alternating in
Q. How is photic energy absorbed by chlorophyll transfered to ATP molecules in photophosphorylation and How will be the resulting ATP used? Light excites energizes and chloroph
Q. What is the difference between diastoleSystole and systole and diastole are the two stages into which the cardiac cycle is divided Diastole is the stage of the cardiac cycle
Since erythrocytes red blood cells do not hold any sub cellular organelles they are essentially a membranous sac for carrying haemoglobin their plasma membrane is a convenien
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