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!
Q. Biological species concept?
A biological species as defined by Ernst Mayr are "groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups". For example there are some species called sibling species that are reproductively isolated although they have extremely minute genetic differences. This definition assumes that a species cannot interbreed with other species due to a variety of isolating mechanisms that are behavioural, physiological, genetic, etc. Thus, according to the biological species concept, individuals within a species have a gene pool available for recombination through sexual reproduction within the group, and is not inhibited by pre - or post -mating reproductive isolation. The main criticism of this definition is that it applies only to organism (i.e. life forms) that have sexual reproduction, and ignores the fact that some times gene flow occurs between closely related, sympatric species (species whose geographical ranges overlap).
For example, significant gene exchange has happened between bison and bus (domestic cattle). Such occurrences violate the basic notion of the biological species concept. Nevertheless, this definition of a species continues to be widely used even today.
A 19 year old model for Glamour magazine tripped over an extension cord causing injury to her epidermis. She is afraid the injury will leave a scar. Based on your knowledge of rege
Nitrification - Nutrient Cycles Ammonia or ammonium salts, are converted into nitrate in a process termed nitrification to be useful to most autotrophic and heterotrophic orga
Explain the Superficial Minor Burns? Superficial minor bums are immersed immediately in cool water if possible. The burn is carefully cleaned to prevent infection. If dirt is d
The coronary sinus is the main vein of the heart and is about 3 cm. long. It lies in the coronary sulcus at the posterior surface of the heart in the posterior atrio-ventricular g
Electrophoresis is the technique of separating the large molecules (for instance DNA fragments or proteins) from the mixture of identical molecules. An electric current is passed
Q. How is urea formed in the human body? Urea is a product of the degradation of amino acids, in the process amino acids lose their amine group which is then transformed into
Which of the following experimental steps permitted Hershey and Chase to verify that the transforming agent in a bacteriophage is DNA as well? A. Phage particles were mixed wit
Explain Spread Plate Method - Pure Culture Techniques? In this method, diluted microbial suspension containing about 30 to 300 colonies is spread uniformly on the agar surface
About 90% of ozone of atmosphere resides in stratosphere (16 to 40 km) layer of atmosphere as ozone layer. It protects life on this planet from harmful U.V. radiations. In absence
Why is rubella during gestation a threat to the fetus? If occurring during gestation rubella is a dangerous disease due to the virus crosses the placenta and contaminates the f
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