254, equivalent to the offspring of a parent and child or a full sibling union. His oversized tongue and frequent drooling were other notable characteristics documented in contemporary accounts, all symptoms pointing to a deeply compromised genetic pool.
The Genetic Collapse of the Spanish Habsburgs: Why the Line Went Extinct
His reign serves as a pivotal case study in population genetics, illustrating how royal convenience can lead to dynastic collapse. While other Habsburg rulers, such as Philip IV, also engaged in inbreeding, the concentration of recessive alleles reached its peak with Charles II.
Physical Manifestations of Inbreeding Charles II’s physical appearance was profoundly affected by his lineage. The war ultimately ended the Spanish Habsburg line, transferring the throne to the Bourbon dynasty and marking the end of Habsburg rule in Spain.
The Genetic Downfall of the Spanish Habsburgs
This extreme inbreeding explains his multifaceted health deterioration and highlights the biological limits of dynastic politics. The cumulative effect of these unions concentrated recessive genetic traits, transforming what was once a calculated political strategy into a hereditary curse that manifested in the final generation of Spanish Habsburgs.
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