An individual with “short” height genes, even if he/she is in a very good nutritional environment, will never be able to be taller than average. This shows that: 

1
the role of the environment is almost fixed, whereas the impact of heredity can be altered
2
how a person will develop depends on the heredity but how far a person can develop depends on environment
3
genes set the limit and within that limit the environment influences development.
4
heredity set the limit and within that limit the genes influences development.

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