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!
Coevolutionary relationships between parasites and their hosts can be more complicated than between predators and their prey. As in the case of prey-predator relationship, one can expect hosts to evolve more effective defences against the parasite, and the parasite in turn can evolve to be more virulent. A balancing act has to be done here also as the parasite cannot afford to increase its own reproductive efficiency at the expense of the host. The death of the host would mean the death of the parasite before it could be transmitted to another living host. If the parasite has to be transferred from one host to another the parasite must evolve a lower degree of virulence so as not to kill the host. Successful host-parasite relationships are evolved on the dictum of "live and let live".
The well known Australian example illustrates the coevolution concept between rabbit hosts and myxorna virus parasite. European rabbits Oryctolagus cuniculus were first introduced into the Australian continent in the middle of the 19th century. In less than ten years the population multiplied into enormous numbers occupying a wide variety of environments in Australia from subalpine to subtropical zones. Towards the middle of the 19th century there were several hundred million rabbits. The rabbits had attained the status of a serious pest population. In order to control very effectively the population size, a search of natural enemies for the rabbits was made. Such a search reiealed that myxoma virus could multiply as an epizoite on rabbits and that mosquitoes could be the natural vectors for the mechanical transfer of the parasite.
charecterstic features of phylum protozoa.
Promoters The promoter region contains the DNA sequences that allow the formation of the transcription initiation complex that give the specificity of expression. Promoters are
a) Water demands vary among communities. Discuss some of the factors affecting water uses. b) A coastal town has a resident population of 8000 people during the winter months
Flowering - Development of plant One of the major changes that occur during the life cycle of a plant is the transition from vegetative stage to the flowering stage. In this t
Q. What are the Keys for Identifying plants and animals? Keys are determined as devices to help in identifying plants and animals. These are merely an aid to identification bas
i want to learn
Explain the Interaction of Vitamin A with Vitamin E? Of the various nutrients, the interaction of vitamin E, proteins, zinc and iron with vitamin A is of significance. Know? Le
How the foams are formed? Formation of a foam is dependent on a foaming agent in the continuous phase prior to dispersion of gas. The foaming agent must be adsorbed at the su
Planning of Nursing Care Minimise trauma to the child and provide safe environment. Control bleeding. Administer drugs. Implementation of Nursing Care
how efect of gravity on roots?
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