What are the major conventional symbols and signs used in genetic family trees?
In the genetic family trees the male sex is usually represented by a square and the female by a circle. The Crossings are indicated by horizontal lines that connect squares to circles and their direct offspring are listed below and connected to that line. The presence of studied the phenotypical form is indicated by a complete hachure (shading) of the square or the circle correspondent to the affected individual. It is useful to enumerate the individuals from left to right and from top to bottom for easy reference