Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
Define the Redia Larva? Redia is the third larval stage in the life cycle of F. heputicn. Redia develops from the germ cell Is of the sporocyst and comes out of the sporoc
a well lablled diagram of a tilapia
Assume for this question that we are discussing a rare human disorder. Describe as detailed as possible the characteristics of this disorder if it is: autosomal dominant autosomal
The various types and their description of Heart failure are as follows: Left Sided Versus Right Sided Heart Failure Predominantly left sided failure is seen in left ventr
Blotting method to detect particular one proteins Ans) Western blotting
What is the optimum percentage of forest area recommended by the national forest policy (1988) for the plains and the hills respectively? List any four problems caused because of d
Intramuscular Route of Injection Purpose When rapid action is required. When drug would prove irritating to the subcutaneous tissue. Site selected must be whe
What is the inactivation of the X chromosome? What is a Barr body? The Inactivation of the X chromosome is a phenomenon that occurs in women. Ever since women have two X chromo
Define the word colloid The word colloid, you may be interested to know, is derived from the Greek word "kolla" meaning "glue" and is defined as a system containing particles o
Nursing Interventions Primary goals in acute rheumatic fever are: Control and eradication of the infecting organism. Prevent cardiac complications. Relieve
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd