Revision summary
Four genetic forces plus culture make human diversity. Mutation invents; selection sorts; drift rumples small groups; flow mixes. Malaria and dairying are gene–culture cases. Indian data show both isolate drift and long-range mixture. Races as types fail; clines and histories hold.
Model answer
Introduction
Human diversity is patterned difference in genes, bodies, and, by extension, the cultural niches that change survival. Four forces of population genetics, plus culture, make that pattern.
Body
The four forces
- Mutation supplies new alleles. Most are neutral or harmful; a few, like lactase persistence or sickle-cell, matter.
- Selection retains what fits a niche. Malaria shapes haemoglobin. Ultraviolet light and diet shape pigmentation and stature clines, which Livingstone and later geneticists refused to treat as races.
- Drift is strong in small founder groups. Island and tribal isolates, including some Andaman and Himalayan populations, show this.
- Gene flow mixes. Indian caste and tribal history is a story of flow as much as of barrier, which Sanghvi and later autosomal studies mapped.
Culture as a force
- Durham and gene–culture coevolution: dairying selects lactase; yam farming and malaria select sickle cell in West Africa.
- Migration, marriage rules, and cousin preference change effective population size and inbreeding.
What diversity is not
- Typological races are not evolutionary units. Clines and clusters from history are.
- Language and caste are social. They can still structure mating and therefore genes.
Flow diagram
flowchart TD MU[Mutation] --> D[Diversity] SE[Selection] --> D DR[Drift] --> D GF[Gene flow] --> D CU[Culture marriage] --> SE CU --> GF
Conclusion
Mutation, selection, drift, and flow, working through culture and marriage, create human diversity. The product is clines and local histories, not a few fixed types.
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