In human beings,the colour of skin is controlled by

Height is an example of:

In a plant,the weight of fruits is determined by the number of dominant alleles for several genes. If seven categories of weight are obtained,how many loci are involved in this trait?

Who first noted polygenic inheritance?

It is easier to study polygenic inheritance of characters in plants than in animals because in plants:

The phenotype of one parent for skin colour is $AABBCC$ and the other parent is $aabbcc$. What will be the skin colour and genotype for their progeny?