Holiday in Nidwalden – Nidwalden Travel for Only half of each parent’s genes are passed on to a child. In turn, a grandchild carries on only one-fourth of a grandparent’s genes, and a great grandchild only one-eighth. This exponential decrease continues indefinitely, such that distant descendants are genetically little more related to us than complete strangers living on the other side of the globe. Our memes, in contrast, may survive relatively intact across countless generations. Dawkins explains that as each generation passes, the contribution of your genes [to your progeny is halved. It does not take long to reach negligible proportions. . Holiday in Nidwalden – Nidwalden Travel 2016.