as the trait is dominant and controlled by a single gene, the mutation must have occurred on both diploid copies. true or false?

False

Explanation:

A dominant trait is a trait that is inherited from parents. It is a trait that is obtained from a particular copy or type of a gene that overshadows or overwhelms the effects of another type or copy of that gene. Dominant traits are controlled by a single gene.

Therefore , as the trait is dominant and controlled by a single gene,the mutation must have occurred on both diploid copies is a false statement.

its c its is a mixture of gases

close lines strong magnet less close weaker