What are the conventional signs used in genetic family trees, Biology

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What are the main conventional symbols and signs used in genetic family trees?

In genetic family trees the male sex is usually shown by a square and the female by a circle. Crossings are specified by horizontal lines that attach squares to circles and their direct offspring are listed below and linked to that line. The presence of the studied phenotypical form is specified by a complete hachure (shading) of the circle or the square correspondent to the affected individual. It is useful to enumerate the individuals from left to right and from top to bottom for simple reference.

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