Whenever an interest in land according to the provisions of this Act shall be vested in several persons as co-trustees or in joint tenancy, such persons shall for the purposes of this Act be considered as jointly interested, and entitled to one vote only in respect of their joint interest; but any one or more of such persons may, unless the other or others of them shall dissent therefrom, act or vote under this Act; and the majority in number of any such persons may, notwithstanding any dissent of the minority, act or vote under this Act in the same manner as if all such persons had concurred; and whenever several persons as tenants in coparcenary or in common shall be so interested, each coparcener or tenant in common shall for the purposes of this Act and to the extent of the value of his respective undivided share, be deemed separately interested and entitled to vote as if he were tenant in severalty.