Uniformity Rule (1st Mendelian Rule)

Definition and example - easily explained

According to the rule of uniformity, the descendants of a homozygous (homozygous) genital paresis, which differ in only one trait (for example, color - one flower red, the other white), are always uniform. Accordingly, this means having the same phenotype.

* In dominant-recessive inheritance, only one gene prevails, in this example (see picture) the color is red dominant. The genotype of branch generation1 consists of one dominant gene R and one recessive gene w for each flower. As a result, the dominant R prevails and the flowers both turn red.

* In the case of an intermediate inheritance, all flowers of the branch generation1 would form a mixed form, since neither R nor w would be dominant.

Uniformity rule in a dominant-recessive inheritance

Uniformity rule in an intermediate inheritance

Summary

The branch generation1 of a homozygous parental generation in one trait always forms only one uniform phenotype. This applies to both intermediate and dominant-recessive inheritance.