$A$ characteristic showing continuous variation is controlled by a

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?

Which one of the following pairs of features is a good example of polygenic inheritance?

In human beings,multiple genes are involved in the inheritance of

Polygenic traits exhibit $....$.

The inheritance of human skin color is an example of ........