Which genotype below represent a dihybrid individual

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons