Word Origin and History for mesopotamian. ancient name for the land that lies between the Tigris and Euphrates rivers (in modern Iraq), from Greek mesopotamia (khora), literally a country between two rivers, from fem. of mesopotamos, from mesos middle (see medial (adj.)) + potamos river (see potamo-).
Monogenic forms, caused by a single mutation in a dominantly or recessively inherited gene, are well-established, albeit relatively rare types of PD. They collectively account for about 30% of the familial and 3%â5% of the sporadic cases.
Â· just now. Report Abuse. They're passed on through genes. Each chromosome holds a bunch of genes, and during meiosis and mitosis the chromosomes are replicated. Genes of the father and genes of the mother combine, and whatever trait (genotype) is dominant is the trait that is displayed in the offspring (phenotype). have brown eyes that is the expressed phenotype. The genotype is both alleles one from each parent, in my case its heterozygous meaning different alleles, i am Bg. Brown is dominant over blue which in turn is dominant over the recessive green.