The pedigree analysis illustrates the inheritance pattern of the disease. In the pedigree analysis chart below, males are indicated by the square shape and females are represented by circles.

In 1909, not long after Mendel's principles of inheritance became well accepted, Carl Correns noticed some strange patterns of inheritance in four-o'clock plants, Mirabilis jalapa (Pierce, 2005 ...

By experimenting with pea plant breeding, Gregor Mendel developed three principles of inheritance that described the transmission of genetic traits before anyone knew exactly what genes were.