Genetic family tree is schematic family
tree that the biological
inheritance of trait through
successive generations.

family trees are useful
it is practically impossible ethically
unacceptable to make
crossings for genetic testing
human beings. With the of family
tress the is made by analysisof
(and crossings) that have
occurred in the past. the
analysis of family , for example,
information on of the
emergence of phenotype and
genotypes (including diseases)
in the offspring a couple can be
.