If a child is born with a trait known to be caused by inheriting two recessive gene versions, what must be true about their parents?

At least one parent must physically show the same trait.

Neither parent can possibly carry the gene for the trait.

Both parents must have been exposed to the same environmental trigger.

Both parents must carry at least one recessive version of the gene.

A family tree shows that a specific trait is present in a grandparent and a grandchild, but not in the parent who links them. What does this suggest about the parents?

The parents are carriers of the trait.

The trait is dominant in this family.

The trait is passed directly from grandparent to grandchild.

The child's trait is a result of environmental factors.

An individual who displays a specific genetic trait very strongly.

An individual who has a gene version for a trait but does not show the trait themselves.

An individual whose traits are determined solely by environmental factors.

An individual who is the first in a family to develop a new genetic mutation.