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Related Concept Videos

Synteny and Evolution02:31

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...
The Evidence for Evolution02:55

The Evidence for Evolution

Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.
Limits to Natural Selection01:38

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...
Incomplete Dominance01:43

Incomplete Dominance

Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
Genetic Variation01:25

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...

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Related Experiment Video

Updated: Jun 25, 2026

Primer Extension Capture: Targeted Sequence Retrieval from Heavily Degraded DNA Sources
15:28

Primer Extension Capture: Targeted Sequence Retrieval from Heavily Degraded DNA Sources

Published on: September 3, 2009

How Neandertals inform human variation.

Milford H Wolpoff1

  • 1Department of Anthropology, University of Michigan, Ann Arbor, 48109-1092, USA. wolpoff@umich.edu

American Journal of Physical Anthropology
|February 20, 2009
PubMed
Summary

Neanderthals, once viewed as a separate species, are now understood through genetic and anatomical evidence to have interbred with early humans. This suggests Neanderthals may represent a distinct human race, not a different species.

Area of Science:

  • Paleoanthropology
  • Human Evolution
  • Genetics

Background:

  • Neanderthals are the most abundant human fossil remains.
  • Their interpretation has been historically controversial, with debates on species status.
  • Previous views often positioned Neanderthals as an out-group to modern humans.

Purpose of the Study:

  • To re-evaluate the taxonomic and evolutionary status of Neanderthals.
  • To integrate recent genetic and anatomical evidence.
  • To explore the possibility of Neanderthals as a distinct human race.

Main Methods:

  • Analysis of abundant fossil remains.
  • Review of anatomical interpretations.
  • Examination of recent genetic evidence regarding interbreeding.

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A Comparative Approach for Quantitative Cell Counting Studies in Widely Different Mammalian Brains

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Last Updated: Jun 25, 2026

Primer Extension Capture: Targeted Sequence Retrieval from Heavily Degraded DNA Sources
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Primer Extension Capture: Targeted Sequence Retrieval from Heavily Degraded DNA Sources

Published on: September 3, 2009

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Optimized Bone Sampling Protocols for the Retrieval of Ancient DNA from Archaeological Remains

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A Comparative Approach for Quantitative Cell Counting Studies in Widely Different Mammalian Brains

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Main Results:

  • Genetic evidence supports anatomical data suggesting interbreeding between Neanderthals and other humans.
  • Neanderthals exhibit anatomical differences from modern humans.
  • Gene flow between Neanderthal and modern human populations appears to have been restricted.

Conclusions:

  • Neanderthals likely interbred with early modern humans.
  • The combination of anatomical distinctiveness and gene flow suggests Neanderthals could be classified as a human race.
  • This challenges the traditional view of Neanderthals as a separate species.