3.In humans the allele for tongue rolling (R) is dominant over the allele for non-tongue rolling (r). What is the percent chance of the offspring having
the same GENOTYPE as the parents?

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass