We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy

One of the Most Famous is that of Darwins Finches Essay Sample

essay
The whole doc is available only for registered users OPEN DOC
  • Pages:
  • Word count: 798
  • Category: darwin

Get Full Essay

Get access to this section to get all help you need with your essay and educational issues.

Get Access

One of the Most Famous is that of Darwins Finches Essay Sample

There are many examples of natural selection. One of the most famous is that of Darwin’s finches. He observed these birds when he travelled to the Galapagos Island when on his travels on the HMS Beagle. He observed the differences in the size and shape of the bird’s beaks on the different islands, as they had evolved to eat different food types on the different islands of the archipelago. He brought back samples of the birds and these are now preserved in the Darwin Centre in the National History Museum in London. Some examples are:

The large ground finch had a strong beak with which to crack nuts open.

The large tree finch has a strong, sharp beak and it uses this to grasp large insects like beetles.

A warbler finch has a small pointed beak and it catches flying insects on the wing.

The cactus finch has a long thin beak so that it can probe between the spines to take nectar from the cactus flowers and eat the seeds.

The woodpecker finch has a very hard beak that it uses to hammer wood, and it is able to use a cactus spine to probe the bark for insect larvae.

Another commonly referenced example of natural selection was observed in the 19th century in Great Britain, and was caused due to polymorphism of colouration in moths. The peppered moth, Biston betularia, had two main forms – a pale wing with darker speckled markings and a very dark coloured wing. The dark wing is called the melanic form as it has a high concentration of the pigment melanin which makes it dark coloured. In 1849 there was only the pale coloured moths in Manchester, but by 1895 the proportion of melanic moths had risen to 95% of the population. In the fifty years or so between then Manchester had become so industrialised that the pollution had turned the surfaces of many buildings and trees black. In polluted areas the darker moths had the selectional advantage as they could not be seen easily by birds and eaten, whereas in unpolluted areas the light speckled moths had the selectional advantage as they blended in on the natural lichen or tree bark. The genotype of melnanic is CC or Cc and pale is cc.

One of the most worrying examples of natural selection is that of antibiotic resistance by a number of bacteria. When a person is prescribed a course of antibiotic medication it is important that they take the complete course and not stop before the end, even if the symptoms have disappeared. The reason for this is that the susceptible bacteria will be killed immediately and those that have a greater resistance are not affected immediately, if at all. This means that they will survive, be spread to another host and will go on to reproduce and infect them. The evolutionary change is that all bacteria will end up deriving from the antibiotic resistant strain, and this will mean that certain antibiotics are useless in treating that particular disease or infection. This is why many GP’s are so cautious about prescribing antibiotics these days, as they have to keep treatments for when they are really needed so as to prevent the spread of antibiotic strains of bacteria. In many areas of the world, “superbugs” have developed. These are bacteria that are resistant to almost every form of known antibiotic, and so are almost impossible to treat. Examples are MRSA (Methicillin-resistant Staphylococcus aureus) and Clostridium difficile.

MRSA – This is the most serious of the hospital superbugs. It has since been re-named multi-drug resistant Staphylococcus aureus. Staphylococcus aureus is a bacteria that causes many types of infection in the human body, from boils to impetigo, and it is extremely infectious. If a MRSA bacterium enters the bloodstream it can cause septicaemia, septic shock, pneumonia, abcesses, meningitis and death. It is mainly a concern for surgical patients in hospitals.

C.difficile – Clostridium difficile (C. difficile) is a bacterium that is present naturally in the gut of around two-thirds of children and 3% of adults. C. difficile does not cause any problems in healthy people. However, some antibiotics that are used to treat other health conditions can interfere with the balance of ‘good’ bacteria in the gut. When this happens, C. difficile bacteria can multiply and produce toxins (poisons), which cause illness such as diarrhoea and fever. At this point, a person is said to be infected with C. difficile. Most cases happen in a healthcare environment, such as a hospital or care home. Older people are most at risk from infection, and most cases occur in people aged over 65. Children under the age of two are not usually affected.

We can write a custom essay

According to Your Specific Requirements

Order an essay

You May Also Find These Documents Helpful

Charles Darwin and Humanistic Theories

Humanistic Theories are actually focused on “the capacity for personal growth, freedom to choose our destiny, as well as, our positive qualities that will make us better people” (Ticao, 2001). Darwin exhibited the aforementioned when he was in College wherein in: 1) even though medical studies was excruciating, he did his best to grasp the art of taxidermy; 2) he bonded with the Plinian Society...

Charles Darwin

Darwin’s evolution theory, expounded by the process of natural selection (survival for the fittest) has drawn a lot of controversy, especially in religious, scientific and/or academic sectors. Darwin believed that all the species in existence today originated from a single form of life by a process he called “speciation”.  That is, from the single form of life, gradual branching process led to the species in...

Charles Darwin and the Tree of Life

The documentary known as Charles Darwin and the Tree of Life is a particularly fascinating one. It explains various levels of Charles Darwin's theory of evolution by means of natural selection. In fact, not only does this program discuss the theories of Darwin's adulthood, but it even talks about his fascination with bugs as a child, and his discoveries, that tempt me to believe spurred...

No Argument from Design Is Persuasive

An argument from design is an argument that is close to the Teleological approach, which are arguments for the existence of God because of a general pattern and order in the universe, as opposed to arguments from providence, which are arguments from the provision of needs; of conscious beings. The teleological argument attempts to prove the existence of God by explaining that the world, in...

Biological Psychology

1. What is biological psychology? Biological psychology is the study of the effects of brain function-neurotransmitters, etc.-on cognitive processes and behavior. If there are abnormalities in the brain, thoughts, behavior, learning, memory, and other mental and emotional functions are effected. A small chemical imbalance in the brain can be responsible for any type of psychological abnormality. Biology is the study of physical processes of brain...

Get Access To The Full Essay
icon
300+
Materials Daily
icon
100,000+ Subjects
2000+ Topics
icon
Free Plagiarism
Checker
icon
All Materials
are Cataloged Well

Sorry, but copying text is forbidden on this website. If you need this or any other sample, we can send it to you via email.

By clicking "SEND", you agree to our terms of service and privacy policy. We'll occasionally send you account related and promo emails.
Sorry, but only registered users have full access

How about getting this access
immediately?

Become a member

Your Answer Is Very Helpful For Us
Thank You A Lot!

logo

Emma Taylor

online

Hi there!
Would you like to get such a paper?
How about getting a customized one?

Couldn't Find What You Looking For?

Get access to our huge knowledge base which is continuously updated

Next Update Will Be About:
14 : 59 : 59
Become a Member