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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.
Health Hazards with poor management of Bio-medical waste Health hazards associated with poor management of Bio-medical waste are: - Injury from sharps to staff and waste han
Q. What is the nitrogen waste in amphibian larvae and in the adult animal? The terrestrial adult excretes urea since amphibian larvae are aquatic they excrete ammonia.
assignment of digestive gland
Theodosius Dobzhansky and Boris Spassky demonstrated the working of normalising selectioion a behavioural trait in two populations of Drosophida pseudobscura. The two populatiors w
Determine amount of intracellular potassium ions in neuron A Neuron A is a healthy neuron with all the usual ion channels. When at rest with a membrane voltage of R millivolts
Counselling involves a process, the aim of which is to help others to help themselves by making better choices and becoming better choosers of options. The counsellor's repertoire
What are the three main steps for a good study of a genetic family tree? Step 1: to determine whether the studied phenotypical form has a dominant or recessive pattern. Step
Particulate matter in gaseous effluents consists of particles of size ranging from 0.1 um to 100 um. The device selection is based upon physical and chemical characteristic of part
#what is adaptation?
Your breakfast consists of a cup of black coffee with sugar as well as a plain bagel covered with cream cheese. Describe the digestion of this breakfast as it passes through each m
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