Breeders are working to prevent losing heterozygosity and to maintain sufficient genetic variations, but high kinship value means the breed is not able to maintain a steady level of inbreeding in the long term.
In 1963, he succeeded as Earl Grey, following the death of his second cousin twice removed Charles Grey, 5th Earl Grey.
The observed endogamy is primarily consanguineous marriages, where the bride and the groom share a biological grandparent or other near ancestor.
In 1058, after Pope Nicholas II strengthened existing canon law against consanguinity and on that basis, Guiscard repudiated Alberada in favour of a then-more advantageous marriage to Sichelgaita, the sister of Prince Gisulf II of Salerno.
Family, a group of people affiliated by consanguinity, affinity, or co-residence
Alongside the Mosuo, the Pumi here adopt a matriarchal system linked to the Azhu system, which literally means friendship, and families are formed by virtue of consanguinity instead of marriage.
A marriage with Adela was within the prohibited degree of consanguinity and Simon went to Rome to meet with Pope Gregory VII, perhaps to arrange a dispensation.
Three bishops—Pelagius of Oviedo, Diego of León, and Muño of Salamanca—and the abbot of Samos were deposed by the council for having opposed the marriage of Alfonso to Berenguela of Barcelona on grounds of consanguinity.