The pedigree can help predict the genotype of each person for a certain trait. 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. A and B found below. Answer the questions that follow concerning each figure. Individuals on a pedigree chart that have unshaded symbols have at least one dominant gene, and show the dominant trait. Place lower case letters under the person's symbol.