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Which of the following events occurred first ?
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- DNA structure of genes was discovered by James D Watson and Francis Crick
- Yuri Gagarin became the first man in space
- World’s first human heart transplant was performed by Dr. Christian Barnard
- World’s first test tube baby Louise Brown was born in U.K.
- DNA structure of genes was discovered by James D Watson and Francis Crick
Correct Option: A
Discovery of DNA structure of genes: 25 April, 1953; Yuri Gagarin's feat of becoming the first man in space: 12 April, 1961; World's first human heart transplant: 3 December, 1967; and World's first test tube baby: 25 July, 1978.
