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Members belonging to different species refrain from mating because of the behavioural differences between them. Such behavioural differences usually centre around specific courtship patterns which the species have evolved. The behaviour patterns are more conspicuous in animals rather than in plants. And among animals, once again, the courtship behaviour is more pronounced among terrestrial and fresh water organisms than in marine forms. Mayr points out that in those forms where there is an elaborate courtship behaviour the interspecific hybrids are rare. Closely related species that do not have pair-binding courtship rituals do commonly give rise to hybrids. Mayr is of the opinion that in species where there is a courtship behaviour pattern, the "engagement" may be broken if the pairs do not belong to the same species, A detailed study of the courtship behaviour of six species of Drosophila showed that courtship and mating could be divided into six phases. If there is incompatibility at any one of these six phases, the potential mates break off and the courtship is discontinued. Under laboratory conditions, the interspecific crosses have not been successful and the courtship was terminated even in the first stage. What is more interesting here is that even to a trained observer differences in courtship behaviour exhibited by different species may appear to be trivial and insignificant. But the species recbgnise the specific signals and respond suitably. In certain other forms differences in courtship behaviour between species could be very pronounced, The courtship dances of the different species of Uca (shore crab) could be recognised from a distance. This is also true of mating dances of salamanders, turtles and birds.
Explain Transition Period from Renaissance to Modern Period? The transition period from the Renaissance to the Modern period produced many notable workers and much literature.
Chromophore - Development of plant The chromophore is a tetrapyrrole molecule like chlorophyll, but unlike chlorophyll it is an open tetrapyrrole and contains no metal ion. It
which is the last enzyme in the thrombotic system?
Major Criteria 1) Positive blood culture • Typical microorganism for infective endocarditis from two separate blood cultures Viridans streptococci, Streptococcus bovis, HAC
What is a single cell protein? The proteins obtained from microbial sources, i.e. algae, fungi, bacteria, yeast etc. are referred to as Single Cell Proteins. These are isolated
What is tubal pregnancy? Many times fecundation takes place in the Fallopian tubes. Usually the newly formed zygote is taken to the uterus where nidation and the embryonic deve
Question 1 What is standard operating procedure manual (SOP)? Do you think it is important to maintain SOPs in all the laboratories? List the advantages of maintaining SOPs in
I recently rented Physiology, An Integrated Approach and I was looking online because I have to also get the A&P access code and realize I could have rented it too with my book. Is
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Q. Explain about precautionary principle? The ethical values of biodiversity highlights the intrinsic value of biodiversity for its own sake and it is independent of the varied
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