Report of 4 families with two or three sibblings who suffered from different malformations of skeleton system and dwarfism.
In the first family is supposed, that the different severe chondrodysplasie of three children who descended from healthy parents was caused by a recessive gen which is unstable in manifestation.
In the second family was found that a dwarfic mother had two sons with phenotypical differences on chondrodysplasie.
In the third family a sister who was less deformed and a brother with severe dwarfism (among 13 sibblings) showed different phenotypes of a rare (skeleton) system sickness in any way related to chondrodysplasie. Consanguinity of their parents seems to be expression of a single recessive gen.
In the fourth family were found two brothers who had healthy, blood related parents. The abnormities of their skeleton system are supposed to be a rare form of dysostotic dwarfism.
The observations above communicated may show how many special gens exist in pathological human genetics. The phenotypical differences of special human deformities seem to prove a dependence from a respective genotypical association.