 The properties of the inheritance systems that Jablonka and Lamb chose to study are those they deemed to be most pertinent for understanding inheritance, and its evolutionary consequences (Jablonka 2001: 100). In more recent work Jablonka and Lamb (2005/2014) distinguish between properties of the way information is reproduced, and properties related to whether variation is targeted, responsive to the environment, or otherwise biased (the so-called “Lamarckian dimension”). Among the properties of reproduction of information that they identify are whether reproduction results from ordinary cellular activity and relies on general purpose cellular mechanisms or whether a dedicated copying system (i.e., cellular machinery) exists; whether the inheritance system can transmit latent (unexpressed) information or is information necessarily expressed phenotypically; and whether information is transmitted solely to offspring (referred to as vertical transmission) or to neighbors as well (horizontal transmission).