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Information about Cladogenesis

Cladogenesis is an evolutionary splitting event in which each branch and its smaller branches forms a "clade", an evolutionary mechanism and a process of adaptive evolution that leads to the development of a greater variety of sister organisms. This event usually occurs when a few organisms end up in new, often distant areas or when environmental changes cause several extinctions, opening up ecological niches for the survivors. A great example of cladogenesis today is the Hawaiian archipelago, to which stray organisms traveled across the ocean via ocean currents and winds. Most of the species on the islands are not found anywhere else on Earth due to evolutionary divergence.

Cladogenesis is often contrasted with anagenesis, where gradual changes in an ancestral species lead to its eventual "replacement" by a novel form (i.e., there is no "splitting" of the phylogenetic tree).

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Basic topics in
Cladistics is a philosophy of classification that arranges organisms only by their order of branching in an evolutionary tree and not by their morphological similarity, in the words of Luria et al. (1981).
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Plantae
  • Chromalveolata
  • Heterokontophyta
  • Haptophyta
  • Cryptophyta
  • Alveolata

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    • Hawaiian Islands, once known as the Sandwich Islands, form an archipelago of nineteen islands and atolls, numerous smaller islets, and undersea seamounts trending northwest by southeast in the North Pacific Ocean between latitudes 19° N and 29° N.
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    Anagenesis, also known as "phyletic change", is the evolution of species involving a change in gene frequency in an entire population rather than a branching event, as in cladogenesis.
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    species is one of the basic units of biological classification. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring.
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    A phylogenetic tree, also called an evolutionary tree, is a tree showing the evolutionary relationships among various biological species or other entities that are believed to have a common ancestor.
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    evidence of the theory of evolution provides a wealth of information on the natural processes by which the variety of life on Earth developed.

    Fossils are important for estimating when various lineages developed.
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    An adaptation is a positive characteristic of an organism that has been favored by natural selection.[1] The concept is central to biology, particularly in evolutionary biology.
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    Macroevolution refers to evolution that occurs at or above the level of species, in contrast with microevolution,[1] which refers to smaller evolutionary changes (typically described as changes in allele frequencies) within a species or population.
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    Microevolution is the occurrence of small-scale changes in allele frequencies in a population, over a few generations, also known as change at or below the species level [1].
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    Speciation is the evolutionary process by which new biological species arise. There are four modes of natural speciation, based on the extent to which speciating populations are geographically isolated from one another:
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    Population genetics is the study of the allele frequency distribution and change under the influence of the four evolutionary forces: natural selection, genetic drift, mutation and gene flow. It also takes account of population subdivision and population structure in space.
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    Natural selection is the process by which favorable traits that are heritable become more common in successive generations of a population of reproducing organisms, and unfavorable traits that are heritable become less
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    In population genetics, genetic drift (or more precisely allelic drift) is the statistical effect that results from the influence that chance has on the survival of alleles (variants of a gene).
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    In population genetics, gene flow (also known as gene migration) is the transfer of alleles of genes from one population to another.
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    mutations are changes to the base pair sequence of the genetic material of an organism. Mutations can be caused by copying errors in the genetic material during cell division, by exposure to ultraviolet or ionizing radiation, chemical mutagens, or viruses, or can occur deliberately
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    Evolutionary developmental biology (evolution of development or informally, evo-devo) is a field of biology that compares the developmental processes of different animals and plants in an attempt to determine the ancestral relationship between organisms and how
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    phenotypic plasticity. Such plasticity in some cases expresses as several highly morphologically distinct results; in other cases, a continuous norm of reaction describes the functional interrelationship of a range of environments to a range of phenotypes.
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    Canalisation (canalization in American English) is a measure of the ability of a genotype to produce the same phenotype regardless of variability of its environment. The term canalisation was coined by C. H.
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    modules, both anatomically and in their metabolism. Anatomical modules are usually segments or organs. When we look at illustrations of metabolic reactions, we find that they, too, are modular: we can clearly identify, for instance, the citric acid cycle as a complex network that
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    Anagenesis, also known as "phyletic change", is the evolution of species involving a change in gene frequency in an entire population rather than a branching event, as in cladogenesis.
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    Catagenesis is an archaic term from evolutionary biology referring to evolutionary directions that were considered "." It was a term used in contrast to anagenesis, which in present usage denotes the evolution of a single population into a new form without branching lines of
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    Evolutionary thought has roots in antiquity as philosophical ideas known to the Greeks, Romans, Indians, Chinese and Muslims. Until the 18th century, however, Western biological thought was dominated by essentialism, the idea that living forms are static and unchanging in time.
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    Charles Robert Darwin

    At the age of 51, Charles Darwin had just published On the Origin of Species.
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    On the Origin of Species
    by Means of Natural Selection

    The title page of the 1859 edition
    of On the Origin of Species
    Author Charles Darwin
    Country United Kingdom
    Language English
    Subject(s)
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    The modern evolutionary synthesis refers to a set of ideas from several biological specialities that were brought together to form a unified theory of evolution accepted by the great majority of working biologists.
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    The evolutionary history of life and the origin of life are fields of ongoing geological and biological research. Although it is not necessary to understand the origin of life on earth to accept evolution by natural
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    For the book see Ecological Genetics (book)
    Ecological genetics is the study of genetics in the context of the interactions among organisms and between the organisms and their environment.
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    Human evolution is the part of biological evolution concerning the emergence of humans as a distinct species from other apes. It is the subject of a broad scientific inquiry that seeks to understand and describe how this change and development occurred.
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