Race is a classification system used to categorize humans on various aspects ,Dobzhansky defined race as a group of population which are reproductively isolated to that extent that exchange of genes is absent or so slow between them.
The characters upon which races are distinguished-
- must be non-adaptive hence least influenced by environmental factors.
- must be hereditary hence genetic in origin.
It means racial features will not be affected by the environmental factors to a large extent while the same will be passed on from one generation to another provided there is gametic isolation between the races.
The racial criteria depends upon
a.population -race is groups of population,these have their own gene pool with differring gene frequencies
b.genetic differences- population forming a race have some genes in very high frequency &s ome in very low frequency these difference charecterize a race
c. reproductively isolated——this isolation maintains genetic difference,however when come in contact,they potentially hybridize&a new gene frequency is set up
d.biological race—–these are identified resulting from isolation, hybridization, selection, mutation & chance
Racial criteria
- Morphological Criteria of Skin Colour
- Morphological Characteristics of Hair
- Morphological Characteristics of Eye
- Morphological Characteristics of Nose
- Morphological Characteristics of Lips
- Morphological Characteristics of Face
- Morphological Characteristics of Head
- Morphological Characteristics of Ear
- Morphological Characteristics of Body Build
For details of each criteria- click here
