Cladistics is a biological classification system that groups organisms based on shared traits and evolutionary relationships. It aims to trace ancestry back to common ancestors by constructing phylogenetic trees based on morphological and molecular data. Key terms in cladistics include plesiomorphy (ancestral traits), apomorphy (derived traits that define groups), and homoplasy (traits that evolved separately in different groups). Together, analysis of character states helps determine evolutionary relationships between taxa.
• The method of classifying organisms into monophyletic group of a common ancestor based on shared apomorphic characters is called cladistics.
• Cladistics is now the most commonly used and accepted method for creating phylogenetic system of classifications.
Cladistics produces a hypothesis about the relationship of organisms to predict the morphological characteristics of organism.
• The method of classifying organisms into monophyletic group of a common ancestor based on shared apomorphic characters is called cladistics.
• Cladistics is now the most commonly used and accepted method for creating phylogenetic system of classifications.
Cladistics produces a hypothesis about the relationship of organisms to predict the morphological characteristics of organism.
The process by which a new species develops from the existing species is known as speciation.
Charles Darwin was the first to describe the role of natural selection in speciation in his 1859 book On the Origin of Species. He also identified sexual selection as a likely mechanism, but found it problematic.
A species can be defined as one or more populations of interbreeding organisms that are reproductively isolated in nature from all other organisms.
When populations no longer interbreed, they are thought to be separate species.
There are four geographic modes of speciation in nature, based on the extent to which speciating populations are isolated from one another: allopatric, peripatric, Parapatric, and sympatric.
Speciation may also be induced artificially, through animal husbandry, agriculture, or laboratory experiments.
Allopatric speciation: It is regarded as the most common type of speciation. It involves the physical separation of a species into two groups. This may occur due to climatic changes, movement of tectonic plates leading to the fragmentation of a mass of land, or eruption of a land mass, formation of waterways, or due to the presence of an impassable mountain range.
Parapatric mode of speciation: It occurs due to partial spatial isolation of populations, and is characterized by a small overlap in their ranges as well as significant gene flow amongst the populations. However, the gene flow reduces due to changes in the local conditions, and the two populations become reproductively isolated.
Sympatric mode of speciation: It involves the formation of new species due to a genetic divergence among a few members of the species inhabiting a single geographic area. Unlike the other modes of speciation, here genetic divergence does not arise due to increase in geographic distance, but occurs within the same niche.
Peripatric speciation was Proposed by Ernst Mayr. In this type of speciation, a small group of members inhabiting a peripheral region of the range undergo reproductive isolation to form a new species. Many a time, it is considered to be a variation of allopatric speciation.
• Biosystematics is simply known as “the study of biodiversity and its origins”. In a broader sense, it is a science through which organisms are discovered, identified, named and classified with their diversity, phylogeny, spatial and geographical distributions.
• Biosystematics is a synthetic branch which uses the characters and data from many disciplines like morphology, anatomy, cytology, genetics, palynology, embryology, ecology, plant geography, phylogeny, physiology, phytochemistry, evaluation and paleobotany. Hence, biosystematics is an integrative and unifying science.
This presentation was given by Dr. Avishek Bhattacharjee in Botanical Nomenclature Course held in Botanical Survey of India, Eastern Regional Centre, Shillong in November 2016. This may be helpful to the undergraduate and post graduate Botany students to understand different types of taxonomic literature, especially Flora, Revision and Monograph.
1.Definition and basic concepts of Biosystematics, , Historical perspectives of Biosystematics and Taxonomy, Stages of taxonomic procedures-alpha taxonomy, Beta taxonomy and Gamma taxonomy,
Neo taxonomy.
Organisms are classified into a hierarchical classification that groups closely related individuals.
The species is the basic biological unit around which classifications are based.
evidences of anatomy, cytology and chemistry to plant taxonomynasira jaffry
taxonomy is based on other disciplines of sciences. in this presentation, there is discussion how anatomy, cytology and chemistry influnces the taxonomy
The process by which a new species develops from the existing species is known as speciation.
Charles Darwin was the first to describe the role of natural selection in speciation in his 1859 book On the Origin of Species. He also identified sexual selection as a likely mechanism, but found it problematic.
A species can be defined as one or more populations of interbreeding organisms that are reproductively isolated in nature from all other organisms.
When populations no longer interbreed, they are thought to be separate species.
There are four geographic modes of speciation in nature, based on the extent to which speciating populations are isolated from one another: allopatric, peripatric, Parapatric, and sympatric.
Speciation may also be induced artificially, through animal husbandry, agriculture, or laboratory experiments.
Allopatric speciation: It is regarded as the most common type of speciation. It involves the physical separation of a species into two groups. This may occur due to climatic changes, movement of tectonic plates leading to the fragmentation of a mass of land, or eruption of a land mass, formation of waterways, or due to the presence of an impassable mountain range.
Parapatric mode of speciation: It occurs due to partial spatial isolation of populations, and is characterized by a small overlap in their ranges as well as significant gene flow amongst the populations. However, the gene flow reduces due to changes in the local conditions, and the two populations become reproductively isolated.
Sympatric mode of speciation: It involves the formation of new species due to a genetic divergence among a few members of the species inhabiting a single geographic area. Unlike the other modes of speciation, here genetic divergence does not arise due to increase in geographic distance, but occurs within the same niche.
Peripatric speciation was Proposed by Ernst Mayr. In this type of speciation, a small group of members inhabiting a peripheral region of the range undergo reproductive isolation to form a new species. Many a time, it is considered to be a variation of allopatric speciation.
• Biosystematics is simply known as “the study of biodiversity and its origins”. In a broader sense, it is a science through which organisms are discovered, identified, named and classified with their diversity, phylogeny, spatial and geographical distributions.
• Biosystematics is a synthetic branch which uses the characters and data from many disciplines like morphology, anatomy, cytology, genetics, palynology, embryology, ecology, plant geography, phylogeny, physiology, phytochemistry, evaluation and paleobotany. Hence, biosystematics is an integrative and unifying science.
This presentation was given by Dr. Avishek Bhattacharjee in Botanical Nomenclature Course held in Botanical Survey of India, Eastern Regional Centre, Shillong in November 2016. This may be helpful to the undergraduate and post graduate Botany students to understand different types of taxonomic literature, especially Flora, Revision and Monograph.
1.Definition and basic concepts of Biosystematics, , Historical perspectives of Biosystematics and Taxonomy, Stages of taxonomic procedures-alpha taxonomy, Beta taxonomy and Gamma taxonomy,
Neo taxonomy.
Organisms are classified into a hierarchical classification that groups closely related individuals.
The species is the basic biological unit around which classifications are based.
evidences of anatomy, cytology and chemistry to plant taxonomynasira jaffry
taxonomy is based on other disciplines of sciences. in this presentation, there is discussion how anatomy, cytology and chemistry influnces the taxonomy
Classical and molecular taxonomic parameters, species concept, systematic gradation of animals, nomenclature, modern scheme of animal classification into sub-Kingdom, division, section, phyla and minor phyla
Animal Classification by Carolus Linnaeus, Binomial Nomenclature, Symmetry types, Coelom types, functions of coelom, General characters of Invertebrate Phylum's
lecture for doctorate students while I was working as researcher assisstance about phylogenetic science, definition,
Understand the most basic concepts of phylogeny
Understand the difference between orthology, paralogy and xenology.
Be able to compute simple phylogenetic trees
Understand what bootstrapping means in phylogeny
Species delimitation - species limits and character evolutionRutger Vos
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Lecture notes are here: https://docs.google.com/document/d/e/2PACX-1vRIv5mKK1fjBby--u97emC7hrqXUbxFQZe63P1FpguuhHLG6xykbwXKeKXCUE5W-LSpakXYCI621xCK/pub
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Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
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unwillingness to rectify this violation through action requires accountability.
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students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
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http://sandymillin.wordpress.com/iateflwebinar2024
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Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
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1. Cladistic
Cladistic Definition
• Cladistics refers to a biological classification system that involves the
categorization of organisms based on shared traits.
• Organisms are typically grouped by how closely related they are and thus,
cladistics can be used to trace ancestry back to shared common ancestors and
the evolution of various characteristics.
• Although the classification of organisms began in the early 1900’s, cladistic
analysis and specific methodology first originated in the 1960’s by Willi Hennig,
referred to as “phylogenetic systematics”.
• This process involves creating phylogenies using morphological and molecular
data to visualize evolutionary history and relationships between species.
Cladistic methodologies
• Cladistic methodologies involve the application of various molecular,
anatomical, and genetic traits of organisms.
• Therefore, with the advent of computational modelling and molecular
techniques (e.g., polymerase chain reaction [PCR]) cladistics are often used in
evolutionary biology for the construction of phylogenetic trees.
2. • Cladistic data is also used to create cladograms (shown below), which consist of
diagrams proposing a hypothesis of phylogenetic relationships between species
based on shared characteristics.
• Thus, depending on a given dataset, the resulting cladogram may differ. For
example, a cladogram based purely on morphological traits may produce
different results from one constructed using genetic data.
• Today, highly advanced computational methods permit the use of multiple
datasets to construct more accurate cladograms.
• Careful scientific analysis is required to rationally determine which cladogram
may be a more correct representation than others.
Cladistic Character States
• In the field of cladistics, specific terminology is used to describe particular
characteristics, termed “character states” among groups of organisms.
• The following are common terms used to describe such character states
(illustrated below):
3. Plesiomorphy
• Plesiomorphy refers to the ancestral traits that a taxon retains throughout
evolution.
• Two or more taxa can share plesiomorphies but reside in different groups.
When this occurs, this is termed “symplesiomorphies”.
• An example of a symplesiomorphy is quadrupedalism, or the ability to walk on
four legs.
• Since this is an ancestral trait exhibited by reptiles, amphibians, and other taxa,
this is a symplesiomorphy for mammals.
• Therefore, while symplesiomorphies can show distant evolutionary trends, it
cannot be used to demonstrate more recently evolved characteristics.
4. Apomorphy
• Apomorphy refers to a derived state used to define specific clades.
• Apomorphy can be further subdivided into “autapomorphies” and
“synapomorphies”.
• Autapomorphies refer to traits that are exhibited only by one species or group,
whereas synapomorphies refer to entire clades which can be classified by the
presence of a particular trait.
• An example of synapomophy includes the presence of digits, shared by all
tetrapods.
• An example of an autapomorphy is the capacity of human verbal speech, which
is not exhibited by other primates, and is thus, a distinguishing human trait.
Homoplasy
• Homoplasy refers to a character state that is shared by at least two organisms
but is not found in the common ancestor or predecessor.
• Thus, the trait is aid to have evolved as a result of convergence or a reversal.
• A famous example of homoplasy is the evolution of warm-bloodedness in both
mammals and birds, despite the absence of this trait from the common
ancestor.
• Therefore, evidence indicates that the trait of warm-bloodedness must have
evolved separately within each clade.