Independence Rule (3rd Mendelian Rule)

Definition and example - easily explained

According to the rule of independence, two (dihybrid inheritance!) Different traits (tail length and coat color) are independently inherited when crossing a pure-hearted parental generation. The features are freely combinable. In addition, from the F2 generation new feature combinations occur.

In the following example, the two individuals of the parental generation differ both in terms of tail length and hair color. Overview of features:

S = short tail
s = long tail

B = brown coat
b = white coat

In the F1 generation, the dominant alleles prevail in each case, so that four brown cats with short tail occur. Already in the F2 generation, all features were combined and even completely new phenotypes occur.

Example of the independence rule

Summary

Different characteristics are inherited independently

Beginning with the F2 generation, a new combination of characteristic values ​​occurs