Allele

an allele is one of possible developments of a gene, which sits at a certain place (Locus) on a Chromosom.

One speaks also of „the switching position “of a gene, those by mutations, i.e., changes in thatCousin sequence of the DNA (DNS), to be varied can. So for example the gene, which is responsible for the color of a bloom, in two different development forms can occur and cause with the plant either a red or a white bloom color.Accordingly one speaks of the allele for the red or of the allele for the white bloom color. In addition, more than two different condition forms of a gene can occur, i.e., more than two alleles arise at a gene place. One speaksthen of multiple Allelie. The alleles for the characteristics of group of bloods „of the group of bloods of A “, „group of bloods of B “and „group of bloods of 0 “are likewise different condition forms of the gene of group of bloods. However here for the controlling of the antigen formation responsible persons are genes over a set of Chromosomenscattered.

Since humans have a double Chromosomensatz, each humans in its diploiden cells on the two homologous Chromosomen at the gene place concerned know either two different alleles of a gene or but equal to two alleles of the gene concerned to possess. In the first caseone speaks of Heterozygotie, in the second case of Homozygotie. This applies also to all other diploiden organisms.

With the Japanese miracle flower the two alleles for the development of the bloom color behave intermediately. It comes therefore to threedifferently colored blooms: If the plant possesses two identical alleles for the red bloom color (homozygoter condition), then a red bloom develops. If the plant possesses two identical alleles for the white bloom color (likewise homozygoter condition), a white bloom develops. Are however two different alleles available, i.e. one for the red and one for the white bloom color (heterozygoter condition), then it comes to the training of a pink bloom (intermediate hereditary course).

Often is it however like that that in the heterozygoten conditionAllele over the other one dominates: The development of the characteristic of the rezessiven allele is suppressed, the characteristic dominant factors is minted (dominance - rezessiver hereditary course).

see also

Polymorphie (biology), to transmission

Web on the left of

• ALFREDS:The of alleles frequency DATA cousin - outstanding organized English-language homepage to the frequency of alleles in defined human populations