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Genetic drift, also known as random genetic drift, allelic drift or the Wright effect, [1] is the change in the frequency of an existing gene variant in a population due to random chance. [ 2 ] Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation . [ 3 ]
The genetic drift caused by a population bottleneck can change the proportional random distribution of alleles and even lead to loss of alleles. The chances of inbreeding and genetic homogeneity can increase, possibly leading to inbreeding depression. Smaller population size can also cause deleterious mutations to accumulate. [3]
In some instances a disease can be carried with no symptoms, which leaves a greater risk of passing the disease on to others. Depending on the disease, some untreated STIs can lead to infertility, chronic pain or death. [12] The presence of an STI in prepubescent children may indicate sexual abuse. [13]
But if left untreated, the bacterial disease, syphilis, can lead to heart, brain or organ damage – even death. Pregnant people can also pass the infection on to their unborn children, leading to ...
The infection can lead to painful genital sores and blisters that typically recur in random episodes throughout life. In 2020, more than 200 million people in the same age group suffered at least ...
The so-called "50/500 rule", where a population needs 50 individuals to prevent inbreeding depression, and 500 individuals to guard against genetic drift at-large, is an oft-used benchmark for an MVP, but a recent study suggests that this guideline is not applicable across a wide diversity of taxa.
A little-known sexually transmitted infection could become a superbug within the next 10 years if the way it is diagnosed and treated isn’t changed, experts have warned. Mycoplasma genitalium ...
The main cause of a decrease in genetic viability is loss of habitat. [4] [9] [10] This loss can occur because of, for example urbanization or deforestation causing habitat fragmentation. [4] Natural events like earthquakes, floods or fires can also cause loss of habitat. [4] Eventually, loss of habitat could lead to a population bottleneck. [3]