Sickle cell disease in an inherited blood disorder. it is a recessive trait. that means you can carry one recessive allele for the disease and not have the symptoms. in this case, if you were a carrier and did not have the disease, your genotype for sickle cell would be

If you're a carrier, you're a heterozygote...So let's say S is normal allele and s is diseased allele, then you'd be Ss.
Someone with sickle cell anemia would be ss (homozygous recessive)

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