$A$ characteristic showing continuous variation is controlled by a

Which of the following statements is correct about polygenic inheritance?

In a case of polygenic inheritance,a trait is controlled by $3$ pairs of genes. If an individual is heterozygous for all $3$ alleles,what will be the phenotypic ratio produced by self-crossing?

Human skin colour is an example of:
$I.$ Multiple gene inheritance
$II.$ Three separate genes controlling this trait
$III.$ Single gene controlling this trait
$IV.$ Two genes controlling this trait
$V.$ Environment plays a significant role in this trait
Choose the correct option.

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 of the following traits is controlled by more than one gene?