Can mutations be inherited by offspring

Natalie had random hand movements when she was two months old. when she was six months old, she used to grab a block with her whole hand. now at the age of ten months, she can grasp the same block with her thumb and forefinger. this sequence of growth in her hand and finger movements is according to the pattern.

Can a trait be both polygenic and have multiple alleles? explain why or why not.

This rapid change in species that rarely leaves behind fossil evidence is referred to as