genetics

[IMG SURVIVOR]

in genetics (http://en.wikipedia.org/wiki/Genetics), dominance relationship refers to how the alleles (http://en.wikipedia.org/wiki/Allele) for a single locus (http://en.wikipedia.org/wiki/Locus_%28genetics%29) interact to produce a phenotype (http://en.wikipedia.org/wiki/Phenotype). For example, flower color in sweet peas (Lathyrus odoratus) is controlled by a single gene (http://en.wikipedia.org/wiki/Gene) with two alleles (http://en.wikipedia.org/wiki/Allele). The three genotypes (http://en.wikipedia.org/wiki/Genotype) are PP, Pp, and pp. The flower color for PP (purple) and pp (white) do not depend on the dominance relationship. However, the heterozygote (http://en.wikipedia.org/wiki/Heterozygous) Pp could theoretically have many different colors: purple, white or pink. The exact color it has reflects the dominance relationship. There are three kinds of dominance relationships:

Simple dominance
Incomplete (partial) dominance
Co-dominance

[MDiva]

Thank you :)

[white-rose]

That's a very nice explanation. Thanks! :)