Variation = difference in the phenotypes of individuals.
- you can measure the difference and show them in graphic form
- individual has a phenotype = because of genotype + environment
- variation in a population is the variation in all individuals
- Vpop. = variation in genotype and variation in environment
- surviving and living in different environments
1.
- different classes or groups
first graph shows variation in population = variation in genotypes (no environment playing a role) - example: Blood groups A, AB, O, B
2.
second graph shows variation in population/species = variation in the genotype + modified by environment (third graph) - example: height in humans...one might inherit genes for a height but it would be modified by quality of diet etc.
- continuous variation
3.
- variation in a population/species = entirely environmental variation
- genes have no role to play in the differences we see in a population
- example: home language
- cannot be inherited
No comments:
Post a Comment