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

  • Pages: 4
  • Word count: 834
  • Rewriting Possibility: 99% (excellent)
  • Category: darwin

Get Full Essay

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

Get Access

Introduction of TOPIC

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

Sorry, but full essay samples are available only for registered users

Choose a Membership Plan
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 on

One of the Most Famous is that of Darwins Finches ...
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 to mold himself with regards to debates; 3) he befriended a Botany professor to know more about the study of plants which is actually one of his addictions; 4) he studied hard for his final exam and asked for his professor in Botany to become his private tutos (About.., 2007). This only means that he actually did something to make his life better (About.., 2007). Furthermore, Humanistic Theories actually follows a phenomenological worldview, which focuses on the importance of our own perceptions toward ourselves, as...

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 existence today. In my opinion, the Public opinion of Charles Darwin has not changed since 1859. This is because the Darwin’s evolution theory is scientific and has been well-supported by scientific evidences, even in studies over the recent times. Fro instance, his theory that species survival or extinction depend its ability to adapt to its surrounding has been scientifically proven. Though many believe in biblical creation, Darwin’s theory still holds and wildly studied. Researches has been conducted since then up to recent and especially a...

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 his desire of study. Charles Darwin among most communities, specifically religious, seem to stereotype him as a cruel and unjust man for his theories. While, in this educational film, it talks about how he would even respect the values of his wife and children, which seem everything but cruel and unjust. His desire to know more was what separated him from most. He desired to know more than the church could tell him. In fact, he even held off on the publishing of his book...

Popular Essays


Emma Taylor


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