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!
An interesting observation made by an American biologist H.C. Bumpus (1899) provides a good explanation for normalising selection. Bumpus collected some 136 injured house sparrows after a severe snow and sleet storm with high winds at Woods hole. Of these birds 64 died, resulting in two groups of sparrows, those that were killed by the storm and the ones that survived. Bumpus, made measurements of a number of randomly chosen traits such as wing length, wing span, tarsus length etc and found that those that were killed by the storm had measurements which fell at the ends of the bell shaped curve. In other words, birds which had either mean or close to the rnean measurements were the ones to survive. Normalising selection generally eliminates during a catastrophe or a stressful situation individuals whose traits vary markedly from the mean values. By way of interpreting Bumpus's observations, it could be said that the birds which were blown down easily by the winds had either their wings too long for their body weight and therefore presented a larger surface area or they had too short wings for their body size and therefore could not fly against strong winds. Prjor to the catastrophe the range of individual measurements was larger as compared to the range of measurements that survived the catastroihe. Every catastrophe may narrow down the variability of the population thereby weeding out suboptimal genotypes.
what is relationship between numbers CPH in photon and frequency of photon? Answer; the photon contains n CPH and its energy is E=hν, when photons energy increases that the num
Q. Concerning their biological function what is the difference between meiosis and mitosis? The main biological function of mitosis is cellular multiplication a fundamental pro
Left internal mammary artery (LIMA): It is most often used for bypassing left anterior descending (LAD) coronary artery and its diagonal branch. The right internal mammary
Explain about the Toxicity - fat soluble Vitamin? Because vitamin A is fat-soluble and can be stored, primarily in the liver, routine consumption of large amounts of vitamin A
Starting at the esophagus, trace the pathway of food through the system. At each organ, indicate anatomical adaptations to the general GI tract tube structure that enhance the spec
how does the digestive system of an arthropod operate
Define cooking,blanching and Canning - thermal processing? Cooking: Cooking is a primary process to make food more palatable and improve taste. This is not used as a preservati
Foot-and-mouth disease Foot-and-mouth disease (FMD) is an extremely contagious viral disease of cloven footed animals most notably cattle, pig and sheep. It is well known for
a solution of 5mMol/L CaCl2 is separated from a solution of 1 micromole/L CaCl2 by a membrane that is selectively permeable to Ca+2 but is impermeable to Cl-1 what are the magnitu
Q. What is the importance of the glucose blood level for human health? The glucose blood level (glycemia) must be kept normal if it is abnormally low there is not sufficient gl
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