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.
A polygenic trait is one whose phenotype is influenced by more than one gene. Trait s that display a continuous distribution, such as height or skin color, are polygenic.Polygenic inheritance. 10.3.1 Define polygenic inheritance. 10.3.2 Explain that polygenic inheritance can contribute to continuous variation using two examples, one of which must be human skin colour.olygenic Trait. A polygenic trait is one whose phenotype is influenced by more than one gene. Trait s that display a continuous distribution, such as height or skin color, are polygenic. Polygenic inheritance. 10.3.1 Define polygenic inheritance.