I would appreciate it if you could explain or show me a link or website...Any kind of help is appreciated.
In a pedigree chart, generations are represented by Roman numerals. Each person in each generation is numbered.
Males are represented by a square and females by a circle.
A horizontal line connecting a male and female is called a marriage line.
Vertical lines represent children.
Children on the vertical line are always placed from left to right, with the child on the left being the oldest.
If we look at a specific trait (earlobe shape ) there are two general shapes of earlobes. The first being individuals with the dominant, free ear lobes (E) and the recessive, attached ear lobes (e). Individuals on a pedigree chart that have unshaded symbols have at least one dominant gene, and show the dominant trait.
Rules one must follow to predict genotype:
Any person on a pedigree chart that has a shaded symbol must be assigned two (2) recessive genes.
Place lower case letters under the person's symbol.
Any person on a pedigree chart that has an unshaded symbol must be assigned a dominant gene.
Place a capital letter under the person's symbol.
To determine the second gene for persons who show a dominant trait a Punnett square must be used.