Fig. 1
From: Breast cancer protection by genomic imprinting in close kin families
Inheritance of paternally-derived genomically-imprinted gene in four types of first cousin families defined by the cousin wife marries: FBS, father’s brother’s son; MBS, mother’s brother’s son; FSS, father’s sister’s son; MSS, mother’s sister’s son. Only in FBS union paternally-derived and genomically-imprinted gene (black dot) continuously retains all three identities (DNA sequence, biochemical structure and functionality) over three generations; in the fetus, one of its copies becomes maternally derived (gray dot)