Mo. Rev. Stat. § 456.1070: Disposition of unappointed property if partial appointment to taker in default — appointment to taker in default.

1. If the powerholder makes a valid partial appointment to a taker in default of appointment, the taker in default of appointment may share fully in unappointed property.

2. If a powerholder makes an appointment to a taker in default of appointment and the appointee would have taken the property in the same form, manner and amount under a gift-in-default clause had the property not been appointed, the power of appointment is deemed not to have been exercised and the appointee takes under the clause.