<span>Gyri
and sulci are the folds and grooves,
respectively, which characterize the surface of the human brain.</span> Gyri
are part of the brain that shows a larger surface of the brain. When the gyri
change in structure or form it shows that a body is encountering sickness and
disorders. Sulci is one of the part of the cerebral cortex that surrounds the
gyri.
Just look at the possibilities of
RrYy x RrYy
It is possible for some offspring to have the genotype rryy, which obviously has no dominant alleles, so the conclusion is not correct.
Medial is the answer as far as i know
There are common elements for humans genetic codes, so, in a sense, they have exactly the same type of units defining it, yet the combination of thrm can determine, among others, the phisical characteristics of a person
it binds a single set of substrates