Genetic Diversity

The genetic diversity is a characteristic describing the level of varieties of genes within same a Espèce (even Sous-espèce). One speaks about intraspecific diversity. It is one of the essential aspects of the Biodiversité, on our planet.

On the level of the phenotype genetic diversity results in a diversity of the phenotypes, such as for example of the skin colors very varied at the Humain S.

In genetics of the populations

This diversity will be all the more large if:
  • the number of alleles per gene is large (it is the polymorphism)
  • the frequencies of each allele will be close one to the other: there is not a majority allele.
  • the frequency S of the individuals hétérozygotes and homozygotes will be balanced (see: balance of Hardy-Weinberg).

On the level of the phenotype genetic diversity results in a diversity of the phenotypes, such as for example of the skin colors very varied at the Humain S.

Factors increasing genetic diversity

This genetic diversity is supported by
  1. the phenomena of genetic Recombinaison;
  2. the change S genetics;
  3. a diversifying Natural selection, due to varied living conditions (such as for example various the artificial selections of the common Cabbage, or at the Dog S).

Factors decreasing genetic diversity

August 1st

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