is the mutation in cri du chat dominant or recessive?

Answer 1

The genetics of cri du chat syndrome do not follow the classic patterns of mendelian inheritance. This is a congenital (rather than "hereditary") abnormality involiving a partial deletion of the short arm of chromosome 5. Approximately 85% of cases result from sporadic de novo deletions, while 15% arise secondary to unequal segregation of a parental translocation.

Answer 2

I don't think it's either. it's caused by a missing part of a gene and is not hereditary. it's a chromosomal abnormality.