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Related Concept Videos

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...
Epistasis01:39

Epistasis

In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
Types of Genetic Transfer Between Organisms02:18

Types of Genetic Transfer Between Organisms

Genetic transfer occurs when genetic information is passed from one organism to another. It occurs via two mechanisms: vertical gene transfer and horizontal gene transfer. Vertical gene transfer occurs when genetic information is transferred from one generation to the next, which happens much more frequently than horizontal gene transfer. Both sexual and asexual reproduction are forms of vertical gene transfer, where one or more organisms pass some or all of their genome onto their progeny.
Microbial Phylogeny01:28

Microbial Phylogeny

Understanding the evolutionary relationships among microorganisms is fundamental to microbial ecology and taxonomy. Phylogenetic trees are essential tools for inferring these relationships, relying primarily on comparative analyses of molecular sequences such as DNA, RNA, or proteins. In microbial studies, these trees typically depict the evolutionary paths of diverse bacterial and archaeal species by mapping genetic differences accumulated over time.Phylogenetic trees are composed of tips,...
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.
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.
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Related Experiment Video

Updated: Jul 20, 2026

Clinical Examination Protocol to Detect Atypical and Classical Scrapie in Sheep
13:42

Clinical Examination Protocol to Detect Atypical and Classical Scrapie in Sheep

Published on: January 19, 2014

Genetic relationships among Turkish sheep.

Metehan Uzun1, Beatriz Gutiérrez-Gil, Juan-José Arranz

  • 1Department of Physiology, Faculty of Veterinary Medicine, Kafkas University, 36040 Kars, Turkey.

Genetics, Selection, Evolution : GSE
|September 7, 2006
PubMed
Summary

Genetic analysis of Turkish sheep breeds using microsatellite markers revealed close relationships among Akkaraman, Morkaraman, and Tuj breeds. These breeds, along with others, showed clear differentiation, particularly between fat-tailed and non-fat-tailed groups.

Related Experiment Videos

Last Updated: Jul 20, 2026

Clinical Examination Protocol to Detect Atypical and Classical Scrapie in Sheep
13:42

Clinical Examination Protocol to Detect Atypical and Classical Scrapie in Sheep

Published on: January 19, 2014

Area of Science:

  • Animal Genetics
  • Sheep Breeding
  • Population Genetics

Background:

  • Understanding genetic diversity is crucial for effective conservation and breeding programs in domestic animals.
  • Turkish sheep breeds possess unique genetic resources that require detailed characterization.
  • Previous studies using mitochondrial DNA hinted at significant genetic backgrounds within Turkish sheep populations.

Purpose of the Study:

  • To elucidate the genetic relationships among various Turkish sheep breeds.
  • To differentiate between fat-tailed and non-fat-tailed sheep populations using nuclear DNA markers.
  • To compare findings with existing mitochondrial DNA-based studies.

Main Methods:

  • Analysis of genetic relationships using 30 microsatellite markers.
  • Phylogenetic analysis based on estimated genetic distances.
  • Factorial Correspondence Analysis (FCA) for population structure assessment.

Main Results:

  • Akkaraman, Morkaraman, and Tuj breeds exhibited the closest genetic relationships.
  • A clear genetic separation was observed between fat-tailed and other Turkish sheep groups.
  • Dendrogram and FCA results consistently differentiated these populations.

Conclusions:

  • Microsatellite data confirms distinct genetic groupings within Turkish sheep breeds.
  • The genetic background of Turkish sheep is significant and warrants further investigation.
  • Findings support targeted breeding and conservation strategies for these valuable breeds.