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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.
What is Ridge morphology The implant-supported prosthesis is affected by the ridge morphology especially implant-supported overdentures which gain dual support from implants an
External factors - Factors Controlling Metamorphosis in Insects In few cases an external factor may be accountable for initiating moulting, as for instance in the blood su
State the Definition of respiration Respiration is an act of breathing. (i.e. rise and fall of the chest). Respiration hastwo parts i.e. inhalation and exhalation. When we bre
Flagellated Protozoan These are protozoan that move by means of one or more flagella and include the largest number of species, about 6,800. Asexual reproduction is by
What are the typical features of mammals? The typical features of mammals are: body (more or less) covered with hair; presence of the diaphragm muscle (that divides the thorax
How Athletes benefit from consuming high carbohydrate foods? Athletes benefit from consuming high carbohydrate foods immediately after ending repeated intervals of intense exer
Menerals are naturally occurring inorganic solids with a crystalline structure and a definite range of chemical formula. Ores are concentrations of minerals in rock.
what is plasmalemma?
Observing root hairs Study the root hairs with a hand lens and view how they are constructed.
Preparation on the Morning of Surgery Morning care Hygiene Bowel and bladder emptying. Oral hygiene, remove dentures if any, no lipstick. Comb and make th
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