Warum die Evolution eine Glatze niemals sehen kann

Why will evolution never stop male pattern baldness? The answer lies in one of the best-known and least intuitive principles of evolutionary biology: the "shadow of selection." This video explains two classic evolutionary theories of aging using a very concrete, everyday example—and shows why some biological problems are structurally beyond the reach of natural selection. Scientific sources used in this video: — Medawar, P. B. (1952). "An Unsolved Problem of Biology." H. K. Lewis and Company. The original paper on the theory of mutation accumulation and the concept of the "shadow of selection." — Williams, G. C. (1957). "Pleiotropy, Natural Selection, and the Evolution of Senescence." Evolution, 11(4), 398–411. The original paper on the theory of antagonistic pleiotropy. — Genetic twin and family studies on the heritability of androgenetic alopecia (approximately 62% variance explained by genetics, based on a cohort of over 205,000 men). — Genome-wide association study (2018), published in Nature Communications, to identify over 600 genomic loci associated with male pattern baldness and their correlation with puberty onset, bone density, and pancreatic function. — Ikram, S. (2019). Documentation of 122 depictions of bald men in ancient Egyptian tomb paintings (c. 2613–525 BCE). Note on scientific context: The correlation found in the 2018 study between hair loss genes and other traits (e.g., earlier puberty onset) demonstrates a statistical relationship, but not a fully elucidated causal mechanism. Applying the antagonistic pleiotropy theory to this specific example is a plausible interpretation presented in this video, not a definitively proven fact. Subscribe to Survival Code for more stories about where the limits of evolution lie. #EvolutionaryBiology #Genetics #Science #Anthropology