Semenya, a double Olympic 800 metres champion, has appealed to the Court of Arbitration for Sport in Lausanne to challenge the rules proposed by the International Association of Athletics Federations (IAAF).
Athletics' governing body banned Russia in November 2015 because of evidence of state-sponsored doping, but Russian athletes cleared by the IAAF can compete as neutrals.
The Olympic champion is appearing before the Court of Arbitration for Sport (CAS) in Lausanne to challenge rules proposed by track and field's governing body that would force her to lower her testosterone.
The South African appeared Monday at the Court of Arbitration for Sport in Lausanne at the start of a landmark hearing to challenge the rules proposed by the IAAF.
Semenya appeared at the Court of Arbitration for Sport in Lausanne to challenge proposed IAAF rules that would force her to lower her testosterone levels.
Athletics South Africa has pledged its "unqualified support" for Semenya and she has received support from other sports.
Tefera upstaged compatriot Yomif Kejelcha to stop the clock in a time of 3min 31.04sec.
The government on Friday launched a campaign dubbed #NaturallySuperior in a bid to drum up international support.
IAAF had denied reports that it would argue that Semenya should be classified as a biological male.
Skinner, the Briton who is one of the leading figures behind Global Athlete, told AFP there was a "disconnect" between the wishes of sports governing bodies and athletes in how their sports are run.
The seventeenth edition of the IAAF World Championships is scheduled to be held between 27 September and 6 October at the Khalifa International Stadium in Doha.
The 21-year-old distance star captured the feature event in the 112th edition of the US indoor classic in 3mins 48.46secs, with Kenya's Edward Cheserek a distant second in 3:53.29.
The World Athletics Championships could be an important test case as they come three years before Qatar hosts football's World Cup in 2022.
China's sports administration and top judicial authority are drafting rules that would apply criminal law to doping cases, official news agency Xinhua said Friday.