ipl-logo

Darwin's Theory Of Evolution By Natural Selection

1098 Words5 Pages

Darwin's theory of evolution is a widely held concept that all life is related through the descent of a common ancestor with modification. It presumes the development of life from non-life and how complex creatures evolve over time from more simplistic ancestors by a process called natural selection. From generation to generation, natural selection occurs from differences in survival, fertility, rate of development, mating success, heritable variations (i.e size, shape, behavior, color) among organisms or changes in traits that eventually confer an advantage in the competition for resources. As Darwin observed different species, he noticed how creatures that carry these variations and survive the “struggle for existence” pass on their heritable traits or traits that …show more content…

It is because of these similarities that indicate why species evolve from a common ancestor in the evolutionary theory. As a result this concept became known as molecular homology. Not only are organisms made of cells that contain similar structures such as the nuclei (animal versus plant), but many species share genetic similarities as well that allow them to reveal their descension from a common ancestor. In fact, the DNA code itself is a homology that links all life on Earth to a common ancestor. For example, all vertebrate animals have backbones because of the genetic transfer of information within cells that allows cells to take up new instructions in making of the body. It is mainly the shared characteristics between species that allows two species to separate from an alike lineage, resulting in biological diversity. Also, homologous chromosomes is another reason why species share similar characteristics as well. Therefore, molecular homology demonstrates a pattern of species resemblances from a common ancestor due to closely related DNA sequences at the molecular

Show More
Related

  • What Is The Main Message Of Your Inner Fish The Genetic Blueprint Of Human Life

    1147 Words  | 5 Pages

    Again, humans are shown to be connected to the animal kingdom through the evidence of like genes in creatures that do not in anyway resemble the human

    Read More

  • Evolution: Similarities Between Bone Structures And Scientists

    644 Words  | 3 Pages

    There are also homologous structures, where scientists can see that organisms have similar bone structures and that it is more likely that they evolved from the same thing, than that they evolved separately and had the same kind of hand structure. In the fossil record, scientists can see how organisms could have evolved because as scientists look further back scientists can see that an organism was different in the past and has changed to adapt to its environment. As scientists look to older fossils scientists can see that they are not as complex as modern organisms so there must have been some time when they began to become more complex. When scientists look at early humans scientists can see that they share traits with us like they could walk on two legs

    Read More

  • Nathaniel T. Jeanson

    338 Words  | 2 Pages

    http://www.icr.org/article/does-homology-prove-evolution/ In the article by Nathaniel T. Jeanson, Ph.D., He makes an analogical comparison with evolution along with what is dubbed the "parking lot" test which questions the theory that homology is evidence for evolution. He goes on to explain the “parking lot” test. When at a parking lot, one will notice various cars that have similar structures, like a chassis, structural pattern and (for the most part) four wheels.

    Read More

  • Flaws Of Abiogenesis

    1298 Words  | 6 Pages

    Numerous organisms have homologous or similar structures many scientists consider to be proof of a common ancestor. Be that as it may, Michael Denton in his book, Evolution: A Theory In Crisis, states that “The evolutionary basis of homology is… severely damaged by the discovery that apparently homologous structures are specified by quite different genes in different species” (149). Basically, the genes responsible for these similar structures vastly vary in different organisms. Furthermore, the differences between the functions of different organisms and their specialized structures show that homologous shapes do not prove evolution (Richards,

    Read More

  • Natural Selection Theory: Darwin's Theory Of Evolution

    937 Words  | 4 Pages

    The fossils showed that they were very different to any organism living at that time. That showed the evolution of fossils. Darwin also look at the similarities is skeletons and bones. The correspondence of structures is typically very close among some organisms. The similarities are less between mammals and birds than they are among mammals, and they are less between mammals and fish.

    Read More

  • Discuss Convergence In Animals Providing Examples From Both Arthropods And Vertebrates

    756 Words  | 4 Pages

    Discuss convergence in animals, providing examples from both arthropods and vertebrates. (discussing convergence in the phylum arthropods with examples from within this phylum and likewise for the vertebrates.) Convergent evolution is the process in which organisms which are not closely related derive akin traits separately due to the need for adaptation to similar environments or ecological niches. There may be resemblances at a phylogenetic level, but the basic DNA sequences are different. Morphologically, convergent evolution occurs when different species live in similar environments and hence adapt to the same environmental factors, such as challenges to reproduction and survival.

    Read More

  • Evidence Of Evolution Lab Report

    713 Words  | 3 Pages

    Then the HBA amino acid sequences are aligned and the number of similarities are used to produce a phylogenetic tree (Figure 1). In Figure 1 we can see that the sperm whale and hippopotamus share the most recent common ancestor. The kangaroo and the sperm whale share the furthest common ancestor. Table 1 shows the actual number of HBA amino acid similarities between the mammals individually compared to the sperm whale. Based on Table 1 we can say that the hippopotamus and the sperm whale share the most recent common ancestor with the highest similarity percentage of 85 percent, the same results given by the phylogenetic

    Read More

  • Charles Darwin Research Paper

    799 Words  | 4 Pages

    Darwin explains how variation produced different species and their structures have helped them adapt to their environments to survive. Darwin also has strong evidence when he provides the proof of common descent by stating, “what could be more curious than the hand of a man formed for grasping, that of a mole for digging, the leg of a horse…” (364). He argues that different species have similar bone structure and descended from a common species. Even though different species have similar structures, they are used for different purposes and are suited to fit them individually.

    Read More

  • Darwin's Theory Of Natural Selection In Schools

    1515 Words  | 7 Pages

    Darwin had noticed similarities among the species, but also the diversity that each shared on their island; he theorized that their differences were based on their location and environments- how they had evolved gradually in order to adapt. He later believed that they had evolved from the same ancestor. His contribution had opened a new door in evolution; natural selection could now explain the similarities between every species and why there were such drastic changes between each. A biologist; Carl Linnaeus, had lived between 1707 and 1778.

    Read More

  • Evolutionary Synthesis Essay

    1313 Words  | 6 Pages

    Evidence of common descent of living organisms has been found by scientists working in a variety of fields over many decades and has demonstrated common descent and that life on earth developed from a last universal ancestor, that evolution does occur, and is able to show the natural processes by which the biodiversity of life on Earth developed. This evidence supports the modern evolutionary synthesis, the current scientific theory that explains how and why life changes over time. Evolutionary biologists document evidence of common descent through making testable predictions, testing hypotheses, and developing theories that illustrate and describe its causes. Comparison of the DNA genetic sequences of organisms has revealed that organisms

    Read More

  • Phylogenetic Trees Lab Report

    241 Words  | 1 Pages

    The purpose of phylogenetic trees are to show the evolutionary history and relationships of different species. The two ways that phylogenetic trees can be constricted by are molecular-based and morphological-based. Molecular-based trees compare whole genome sequences of species (Lundmark 2003). Morphological trees look at the physical phenotypic appearances of different species as a way to separate them (Karaguzel 2009). On account of this, we hypothesized that the molecular-based phylogenetic tree would produce more congruent and reliable results than the morphological-based tree.

    Read More

  • The Importance Of Darwin's Trip To The Galapagos Islands

    597 Words  | 3 Pages

    Speciation is a lineage splitting event that produces tw for more new species. It is caused by geographic isolation, and a lack of gene flow between populations. After waking up from this strange dream in the morning you go onto your computer to research more about Darwin’s

    Read More

  • Intraspecific Evolution

    911 Words  | 4 Pages

    The easiest way to tell how closely related animals within a species are is to look at their DNA and analysis

    Read More

  • Charles Darwin's Theory Of Evolution By Natural Selection

    169 Words  | 1 Pages

    Charles Darwin’s ‘Theory of Evolution by Natural Selection’ sparked a revolutionary scientific discussion, though social and political factors influenced the development of this theory. The ideas of species altering overtime challenged the ‘Single creation’ event of Genesis, as at the time of this revelation it was believed that the Earth was 6000 years old and each species had been individually created in its present form by God. As well as this the theory questioned the fundamental creationism in that organisms were created by God in six days. Darwin’s concept implied that humans were a continuum of the Animal Kingdom and not specially created by God. As a result of this it clashed with the doctrine of the Christian church, jeopardizing

    Read More

  • Charles Darwin's Theory Of Evolution

    899 Words  | 4 Pages

    This helps organisms adapt to their environment and therefore giving these evolved organisms a higher chance of survival and producing more offspring. This inevitably causes these new offspring to be born with their parent’s helpful traits which would result in the population consisting of mostly these evolved offspring; those who don’t adapt will have a lower chance of survival and reproduction. Additionally, Darwin had four key points to prove his theory of evolution which are called the evidence of evolution consisting of the fossil record that helps determine how old a fossil is, geographic distribution of living species which helps explain how different species of an organism are located across the world, homologous body structures that are the same body structures that are the same organ or physical trait that are the same embryonic tissue, but become much more mature structures. Similarities in embryology when the early stages of organisms are very similar (especially in animals with backbones). Darwin also believed that evolution does not follow any particular pattern and is not predetermined.

    Read More

More about Darwin's Theory Of Evolution By Natural Selection

Open Document