Tuvalu

(1) The Sovereign, by the grace of God the Royal Majesty of the United Kingdom of Great Britain and Northern Ireland and Other Realms and Possession, Head of the Commonwealth, Defender of the Faith, is the Sovereign of Tuvalu and, in accordance with this Constitution, the Head of State.
… (Sec. 49)

The provisions of this Constitution referring to the Sovereign extend, in accordance with section 13 (references to the Sovereign of Tuvalu) of Schedule 1, to the Heirs and Successors of the Sovereign according to law. (Sec. 50)

(1) An office of Governor-General of Tuvalu is established.
(2) The Governor-General is the representative of the Sovereign. (Sec. 55)

(1) The Governor-General shall be appointed, and may be removed from office at any time, by the Sovereign, acting in accordance with the advice of the Prime Minister given after the Prime Minister has, in confidence, consulted the members of Parliament.
(2) A person is not qualified to be appointed Governor-General unless-
(a) he has attained the age of 50 years; and
(b) he is otherwise qualified to be elected as a member of Parliament.
… (Sec. 56)

1. The executive authority of Tuvalu is primarily vested in the Sovereign, and in the Governor-General as the representative of the Sovereign.
… (Sec. 62)

(1) An office of Prime Minister is established.
(2) Subject to subsection (3), there shall be such number of other offices of Minister, and they shall have such titles, as are determined by the Head of State, acting in accordance with the advice of the Prime Minister.
(3) The number of offices of Minister (other than the office of Prime Minister) shall not exceed one half of the total membership of Parliament.
(4) One of the Ministers other than the Prime Minister may be appointed to the office of Deputy Prime Minister by the Head of State, acting in accordance with the advice of the Prime Minister.
(5) Subject to section 71 (caretaker governments) and to subsection (6), all Ministers (including the Prime Minister) must be members of Parliament.
… (Sec. 62)

(1) The Prime Minister shall be elected by the members of Parliament in accordance with Schedule 2 (Election and Appointment of Prime Minister).
... (Sec. 63)

(1) The Ministers other than the Prime Minister shall be appointed by the Head of State, acting in accordance with the advice of the Prime Minister.
… (Sec. 67)

(1) A Cabinet is established for Tuvalu.
(2) The Cabinet consists of the Prime Minister and all the other Ministers. (Sec. 73)

The Cabinet is collectively responsible to Parliament for the performance of the executive functions of the Government. (Sec. 74)

(1) All members of Parliament are eligible for nomination as candidates for election as Prime Minister.
… (Schedule 2, Sec. 3)

(1) A Parliament is established for Tuvalu.
(2) Parliament is the representative, legislative and deliberative assembly of Tuvalu.
(3) Parliament shall exercise the functions of decision making and oversight and shall strive to do so through consensus and cooperation. (Sec. 83)

Subject to this Constitution, Parliament may make laws, not inconsistent with this Constitution,
… (Sec. 84)

(1) Members of Parliament shall be elected under a system of universal, citizen, adult suffrage, in accordance with this Constitution and any law made for the purposes of section 89 (electoral laws).
(2) All contested elections of members of Parliament shall be held by secret ballot.
… (Sec. 87)

Subject to section 95 (disqualification from election) a person is qualified to be elected as a member of Parliament if, and is not qualified to be elected as a member of Parliament unless, —
(a) he is a citizen of Tuvalu; and
(b) he has attained the age of 21 years. (Sec. 94)