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Finding exceedingly small differences
- ± the act of finding exceedingly small differences which are neither important nor prominent
en.wiktionary.org/wiki/hair-splitting
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Why is it called a splitter?
Is there a split in the phylogenetic tree?
What is speciation in evolution?
What is peripatric speciation?
Dec 2, 2014 · It is good to have hair-splitters & lumpers.— (emphasis in original) Indeed, Darwin cited the disagreement between splitters and lumpers itself as evidence for evolution in the second chapter of the Origin: the hypothesis of evolution predicts such difficulties in individuating species.
In history, lumpers are those who tend to create broad definitions that cover large periods of time and many disciplines, whereas splitters want to assign names to tight groups of inter-relationships. Lumping tends to create a more and more unwieldy definition, with members having less and less mutually in common.
Jun 10, 2024 · Splitting hairs: Science of biomechanics to understand of bad hair days. Date: June 10, 2024. Source: Trinity College Dublin. Summary: Academics are often accused of 'splitting hairs', but a...
- Definition of Speciation
- Types of Speciation
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Speciation is a process within evolutionthat leads to the formation of new, distinct species that are reproductively isolated from one another. Anagenesis, or ‘phyletic evolution’, occurs when evolution acts to create new species, which are distinct from their ancestors, along a single lineage, through gradual changes in physical or genetic traits....
Allopatric Speciation
Allopatric speciation occurs when members of a population become geographically isolated from one another, to the extent that genetic exchange, through mating, is prevented or interfered with. This may be a result of geographical changes, such as the formation of a mountain by a volcano, island formation, habitat separation by glaciers and rivers, or habitat fragmentation caused by human activity. Alternatively, species members may emigrate, resulting in population separation by dispersal; th...
Sympatric Speciation
Sympatric speciation is the evolutionary process whereby species are formed from a single ancestral species while inhabiting the same geographic area. In contrast to allopatric speciation, the distribution ranges of species which evolve through sympatry may be identical or they may only overlap. Rather than geographic distance prompting a reduction of gene flow between populations, sympatry occurs when members of one population make use of a new niche. This could occur, for example, if a herb...
Parapatric Speciation
Parapatric speciation is an extremely rare case of speciation that occurs when a population is continuously distributed within a geographic area without any specific barriers to gene flow. Nonetheless, the population does not mate randomly within the population, but rather individuals mate more commonly with their closest geographic neighbors, resulting in uneven gene flow. Non-random mating may increase the rate of dimorphism within populations, in which varied morphological forms of the sam...
Morphology– A branch of biology that relates to the structure, form and physical characteristics of an organism.Genotype– The set of genes within DNA that is responsible for particular traits.Population– The community of animals or plants in which interbreeding occurs.Species– The largest group of organisms in which individuals can breed and produce fertile offspring.1. If a population of rats is separated by the formation of a deep canyon, this could result in: A. Peripatric speciation B. Artificial speciation C. Allopatric speciation D.Sympatric Speciation 2. Parapatric speciation would be least likely to occur in: A. Large mammals B. Insects C. Bacteria D.None of the above 3. Which of the following is not a ...
Nov 22, 2017 · Mode of reproduction is a defining trait of all organisms, including colonial bacteria and multicellular organisms. To produce offspring, aggregates must fragment by splitting into two or more groups. The particular way that a given group fragments defines the life cycle of the organism.
- Yuriy Pichugin, Jorge Peña, Paul B. Rainey, Arne Traulsen
- 10.1371/journal.pcbi.1005860
- 2017
- PLoS Comput Biol. 2017 Nov; 13(11): e1005860.
Splitting Hairs. by Faith Brynie, Ph D. Pluck a single strand of hair from your head and you've lost what scientists call the hair shaft. The shaft is made of three layers, each inside the other. The outer casing is the cuticle. Under an electron microscope, the cuticle reveals itself as a series of overlapping layers, something like shingles ...
Mar 26, 2019 · Law of Segregation Definition. Gregor Mendel’s law of segregation states that the two alleles for each trait segregate, or separate, during the formation of gametes, and that during the formation of new zygotes, the alleles will combine at random with other alleles.
