Hair variation in : Keratin and follicle shape
In a classroom, start Hair variation with food, a festival, and a language. The year is , the line is “Keratin and follicle shape,” the figure is 1. Skin and bone are not a basis for rank. Nothing on this page ranks intelligence, worth or civilization by group.
Only to explain mechanisms or public health. Averages never become league tables of worth. No. Clinical decisions need clinicians, not atlas pages. By preferring review-level consensus and labeling open debates. A gradual change in trait frequency across geography, rather than a sharp racial border.
Yes — dairying and malaria are classic feedback loops. See related diversity topics and the atlas page on genetic-distance myths. The trait responds to concrete pressures: light, air, pathogens, diet or demographic history. Multiple genes and environments usually interact; single-gene bedtime stories are rare.
Identify the selective or developmental pressure first. Separate measurement (what we can observe) from folk labels. Expect polygenic architecture unless a clear Mendelian case is known. Check whether similar phenotypes evolved more than once. Ask what trade-offs accompany any protective allele.
Fold the league table. Keep , “Keratin and follicle shape,” and 1 for Hair variation.1
Figures to keep
- Year of the account
- 1
- Figure beside it
- 1
- Topic
- Hair variation
- Line about the life
- Keratin and follicle shape
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