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Gregor Mendel's discovery
(according to Francis Galton, 1822 - 1911):
Mendel's principle of inheritance
combination of autosomal genes
1916, X/Y - chromosomal inheritance
Sex is determined by the male sperm
cell. The Mendelian laws are modified in respect to the inheritance
of the sex chromosomes (X,Y) by this particular male position.
(Th. H. Morgan / Calvin B. Bridges)
Because of the limitations set by the gender, there
are only 4 possible combinations of X/Y chromosomes : No
sons carrying the paternal X1, and no daughters carrying
the paternal Y0 !
Pedigrees drawn with PED