Average annual precipitation and temperature.
A river carrying dirt into a lake
“Golden rice is a genetically modified, biofortified crop. ... Golden rice is genetically modified in order to produce beta carotene, which is not normally produced in rice. Beta carotene is convereted into Vitamin A when metabolized by the human body. We need Vitamin A for healthier skin and immune system”
It is Codominance. Examples for this phenomenon is ABO blood groups.