The Republic of South Africa was established in 1961.
The only change made to the composition of the Parliament was the substitution of the State President for the Queen.
A few significant changes were made later:
Coloured representation was ended in 1968, leaving both the Senate and the House of Assembly representing white voters only.

South West Africa ceased to be represented in Parliament from 1977.

The Senate was abolished in 1981, changing Parliament to a unicameral legislature.
The Republic of South Africa was established in 1961. The only change made to the composition of the Parliament was the substitution of the State President for the Queen. A few significant changes were made later:
Coloured representation was ended in 1968, leaving both the Senate and the House of Assembly representing white voters only.
South West Africa ceased to be represented in Parliament from 1977.
The Senate was abolished in 1981, changing Parliament to a unicameral legislature.
Parliament of South Africa