👉 Nosogeny in biology refers to a process by which two organisms, either within a species or across different species, share genetic material. This can occur through a variety of mechanisms such as crossing over (when gametes exchange genes), reciprocal synaptonuclear transfer (where one nucleus transfers DNA to another), and the fusion of sperm cells with an egg cell during fertilization. In humans, for example, the maternal grandparent of a child is often said to be a nosogenetic grandfather
