News tagged with genetic diversity

Related topics: genes · proceedings of the national academy of sciences · climate change · genetic variation · genome

Using modern human genetics to study ancient phenomena

We humans are obsessed with determining our origins, hoping to reveal a little of "who we are" in the process. It is relatively simple to trace one's genealogy back a few generations, and there are many companies and products ...

Jul 31, 2015
popularity54 comments 7

Cancer's relentless evolution

All living things—from dandelions to reindeer—evolve over time. Cancer cells are no exception, and are subject to the two overarching mechanisms described by Charles Darwin: chance mutation and natural selection.

Apr 02, 2015
popularity23 comments 1

Genetic diversity

Genetic diversity is a level of biodiversity that refers to the total number of genetic characteristics in the genetic makeup of a species. It is distinguished from genetic variability, which describes the tendency of genetic characteristics to vary.

The academic field of population genetics includes several hypotheses and theories regarding genetic diversity. The neutral theory of evolution proposes that diversity is the result of the accumulation of neutral substitutions. Diversifying selection is the hypothesis that two subpopulations of a species live in different environments that select for different alleles at a particular locus. This may occur, for instance, if a species has a large range relative to the mobility of individuals within it. Frequency-dependent selection is the hypothesis that as alleles become more common, they become less fit. This is often invoked in host-pathogen interactions, where a high frequency of a defensive allele among the host means that it is more likely that a pathogen will spread if it is able to overcome that allele.

This text uses material from Wikipedia, licensed under CC BY-SA

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