Human Pedigree Diagrams Animation

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Researchers use standardized symbols to represent individuals.
Circles represent females and squares represent males.
A diamond means sex is not known or is not important.
A filled symbol is an individual who displays the trait being studied.
A horizontal line between two symbols represents a mating.
Offspring are shown from left to right in birth order.
They are connected to one another by a horizontal line, and to their parents by a vertical line.