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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 ...
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 ]
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]
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 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]
Genetic divergence will always accompany reproductive isolation, either due to novel adaptations via selection and/or due to genetic drift, and is the principal mechanism underlying speciation. On a molecular genetics level, genetic divergence is due to changes in a small number of genes in a species, resulting in speciation . [ 2 ]
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 ...
Phase variation is similar to antigenic variation, but instead of changes at the genetic level altering the composition of molecules, these genetic changes result in the activation or deactivation of a gene. [9] Phase variation most often arises from a frameshift in the expressed gene. [9]