A. Any part of a decedent's estate not effectively disposed of by will passes by intestate succession to the decedent's heirs as prescribed in this chapter, except as modified by the decedent's will.
B. A decedent by will may expressly exclude or limit the right of a person or class to succeed to property of the decedent that passes by intestate succession. If that person or a member of that class survives the decedent, the share of the decedent's intestate estate to which that person or class would have succeeded passes as if that person or each member of that class had disclaimed that person's intestate share.