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In the previous section we discussed the concept of species in detail and concluded that the concept of biological species and Mayr's definition of species have a wide acceptance among biologists. In this section we shall proceed to discuss the mechanisms of speciation or the mode of formation of a species. Mayr's definition of species amply makes it clear that to qualify for the title of the species, the individuals must be reproductively isolated from other groups. This naturally raises a question whether a new species could arise from populations occupying the same territory. In other words, should the populations of parent species live in quite separate territories in the formation of new species? In our earlier discussions. on natural selection, you have learnt that originmof adaptations is a gradual process, This is much more true of speciation. Biologists recognise three different kinds of speciation.
Signify the term in details - Pseudocoelom. A body cavity that isn't completely lined by mesoderm. Mesoderm is associated with only the ectodermal surface but not endoderm. The
Q. Describe Ecological phytosociological? Field studies are desirable for an understanding of the relationship of any group of plants. If it is not possible to study the plants
MEIOSIS Every organism is mortal, It becomes old and wornout with advancing age (= ageing ) and ultimately dies ,Before death however ,it reproduces its own kind, so
Pulse wave transducer has one Doppler crystal. This crystal emits a short burst of ultrasound at a certain frequency [PULSE REPETITION FREQUENCY (PRF)]. The ultrasqund is reflec
Response to Heavy Metal Stress Several heavy metals emanating from industrial mining and sewage disposal operations contaminate the environment. Cadmium is a common contamina
Aortic Valve Repair : In, acquired AR associated with VSD and prolapse of a cusp, repair is often successful. VSD is closed and at the same time the prolapsed part of
Q. What is the use of Adrenergic Receptor? Adrenergic Receptors are also subdivided into 2 major categories: ALPHA α - or- BETA β In general, when NE (E) binds to alpha r
Natural selection is a process which directs all biological evolution. It is a process that directs genetic changes which when proved to be adapted to the environment are retaine
Neo-zoonoses In recent times, some of the pre-existing low profile and less frequent zoonoses and some entirely newly recognized zoonoses are emerging with a new dimension. Th
I dissolve 4µg of DNA in 1mL of water. How much of this solution would I need in order to add 10ng of DNA in a reaction?
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