What are 2 difference forms of a single gene called

 An organism which has two different alleles of the gene is called Heterozygous.

Any photo? or something

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.