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Genetic Variation

Genetic Variation

Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles, which...

Synteny and Evolution

Synteny and Evolution

John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...

What is Variation?

What is Variation?

Apart from the measures of central tendency, distribution, outliers, and the changing characteristics of data with time, an important characteristic of any data set is its variation or spread. In some data sets, the data values are concentrated closely near the mean; in others, the data values are more widely spread out from the mean.
The range, standard deviation, standard error, and variance are the different measures of variation.
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Limits to Natural Selection

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...

Evolutionary Relationships through Genome Comparisons

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Genetics of Speciation

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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...

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Updated: Jun 5, 2026

Dissecting the Non-human Primate Brain in Stereotaxic Space

Dissecting the Non-human Primate Brain in Stereotaxic Space

Published on: July 16, 2009

What we don't know about great ape variation.

¹Akiko Uchida is at the Primate Research Institute, Kyoto University, Inuyama, Aichi 484, Japan.

Trends in Ecology & Evolution

|January 18, 2011

Summary

Great ape variation is complex, challenging current species definitions. Further research is needed to understand great ape evolutionary biology and subspecies distinctions.

Area of Science:

Primatology
Evolutionary Biology
Genetics

Background:

Intraspecific variation in great apes is more complex than previously understood.
Current great ape species definitions may encompass distinct subspecies.
Most variation might exist at the population level within single subspecies.

Purpose of the Study:

To explore the complex patterning of intraspecific variation in great apes.
To address unresolved questions in great ape evolutionary biology.
To re-evaluate species and subspecies classifications based on genetic and phenotypic data.

Main Methods:

Comparative genomic analyses of great ape populations.
Morphological and behavioral studies across different great ape groups.

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Dissecting the Non-human Primate Brain in Stereotaxic Space

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Phylogenetic analyses to infer evolutionary relationships and divergence times.

Main Results:

Evidence suggests significant genetic and phenotypic divergence within recognized great ape species.
Population-level variation accounts for a substantial portion of the observed differences.
Ambiguities in species and subspecies delineation are highlighted.

Conclusions:

Current great ape taxonomy requires revision.
Understanding population-level variation is crucial for accurate great ape classification.
Further research is essential to resolve evolutionary histories and define species boundaries.