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  2. Heteroplasmy - Wikipedia

    en.wikipedia.org/wiki/Heteroplasmy

    Intercellular ("between cells") selection occurs on a larger scale, and refers to the preferential growth of cells that have greater numbers of a certain mitochondrial genotype. [8] Selective differences can occur between naturally occurring, non-pathological mtDNA types when mixed in cells, and may depend on tissue type, age, and genetic ...

  3. Genetic drift - Wikipedia

    en.wikipedia.org/wiki/Genetic_drift

    The impact of a population bottleneck can be sustained, even when the bottleneck is caused by a one-time event such as a natural catastrophe. An interesting example of a bottleneck causing unusual genetic distribution is the relatively high proportion of individuals with total rod cell color blindness ( achromatopsia ) on Pingelap atoll in ...

  4. Population bottleneck - Wikipedia

    en.wikipedia.org/wiki/Population_bottleneck

    Population bottleneck followed by recovery or extinction. A population bottleneck or genetic bottleneck is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts; or human activities such as genocide, speciocide, widespread violence or intentional culling.

  5. Introduction to evolution - Wikipedia

    en.wikipedia.org/wiki/Introduction_to_evolution

    A bottleneck can reduce or eliminate genetic variation from a population. Further drift events after the bottleneck event can also reduce the population's genetic diversity. The lack of diversity created can make the population at risk to other selective pressures. [36] A common example of a population bottleneck is the Northern elephant seal ...

  6. Gene flow - Wikipedia

    en.wikipedia.org/wiki/Gene_flow

    Gene flow is the transfer of alleles from one population to another population through immigration of individuals. In population genetics, gene flow (also known as migration and allele flow) is the transfer of genetic material from one population to another. If the rate of gene flow is high enough, then two populations will have equivalent ...

  7. Homoplasmy - Wikipedia

    en.wikipedia.org/wiki/Homoplasmy

    As this cell divides, the mitochondria replicate and independently assort into the daughter cells. This leads to both positive and negative (cell shown in red) homoplasmy. Homoplasmy is a term used in genetics to describe a eukaryotic cell whose copies of mitochondrial DNA are all identical. [1] In normal and healthy tissues, all cells are ...

  8. What Is Peyronie’s Disease? What You Need to Know, From ...

    www.aol.com/peyronie-disease-know-symptoms-risk...

    One 2023 study found that men with fractures were more likely to develop Peyronie’s disease and ED. If they were over 45, the onset of Peyronie’s disease was likely to occur within five years ...

  9. Biotic homogenization - Wikipedia

    en.wikipedia.org/wiki/Biotic_Homogenization

    While this process pre-dates human civilization, as evidenced by the fossil record, and still occurs due to natural impacts, it has recently been accelerated due anthropogenic pressures. [3] Biotic homogenization has become recognized as a significant component of the biodiversity crisis , and as such has become of increasing importance to ...