Here's a family pedigree chart. A pedigree is the display of family information in the form of a legible chart. It is sometimes referred to as a "family tree." Pedigrees make use of a common set of symbols, with squares representing men and circles representing females. Pedigree construction is a family history, and facts about ancestors may be hazy as memories fade. If the person's sex is uncertain, a diamond is utilized. A filled-in (darker) symbol represents someone with the trait in issue. Heterozygotes are identified by a shaded dot inside a symbol or a half-filled symbol. A pedigree depicts relationships as a sequence of lines. A horizontal line connects the parents, and a vertical line connects their offspring. A horizontal sibship line connects the offspring, who are listed in birth order from left to right. If the children are twins, a triangle will link them. When an offspring dies, its sign is crossed by a line. A little triangle represents the offspring whether it is still born or if it is aborted.
