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Genetic stability in the Icelandic horse breed.
M G Campana1, F Stock, E Barrett
1McDonald Institute for Archaeological Research, University of Cambridge, UK. mcampana63@gmail.com
Animal Genetics
|April 14, 2012
Summary
The Icelandic horse, despite its small gene pool, shows a stable effective population size and genetic profile over 150 years. This genetic stability offers resilience against disease and environmental changes.
Area of Science:
- Animal genetics
- Population dynamics
- Equine genomics
Background:
- The Icelandic horse breed has a small effective population size due to historical isolation and population bottlenecks.
- Small populations are vulnerable to disease and environmental shifts.
- Understanding population dynamics is crucial for conservation.
Purpose of the Study:
- To analyze the population dynamics of the Icelandic horse over the last 150 years.
- To assess the genetic profile and effective population size.
- To determine breed resilience despite a limited gene pool.
Main Methods:
- Analysis of historic and modern mitochondrial DNA sequences.
- Examination of nuclear coat color genes.
- Real-time population dynamics modeling.
Main Results:
- The effective population size of the Icelandic horse has remained stable.
- The genetic profile of the breed has shown stability over the 150-year period.
- No significant genetic erosion was detected.
Conclusions:
- The Icelandic horse breed exhibits remarkable genetic stability.
- The breed is resilient to population pressures despite its small gene pool.
- Conservation strategies can be informed by this genetic stability.
Related Concept Videos
01:49Hardy-Weinberg Principle
Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.
01:09Mutation, Gene Flow, and Genetic Drift
In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
01:25Genetic 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...
Genes exist in different versions called alleles, which...
03:33Genetic Drift
Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.
01:43Incomplete 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.
02:39Gene Flow
Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.