There is something wrong with this illustration. At fertilization, gametes combine at random to form the individuals of a new generation. The four haploid cells develop into gametes. He scored different genetic lines for such characteristics as flower color, plant height, seed texture, and followed their inheritance patterns for many generations to determine the basic rules of inheritance. . See last lecture's topic dealing with the independent assortment of chromosomes.
Pedigrees depict family relationships and indicate which ones have a particular trait.
They can reveal the mode of inheritance of a particular trait. Dentinogenesis imperfecta and what it is .