Which of the following events occurred first? (1) DNA structure of genes was discovered by James D Watson and Francis Crick (2) Yuri Gagarin became the first man in space (3) World's first human heart transplant was performed by Dr. Christian Barnard (4) World's first test tube baby Louise Brown was born in U.K.

Which of the following events occurred first? (1) DNA structure of genes was discovered by James D Watson and Francis Crick (2) Yuri Gagarin became the first man in space (3) World's first human heart transplant was performed by Dr. Christian Barnard (4) World's first test tube baby Louise Brown was born in U.K.
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(1) DNA structure of genes was discovered by James D Watson and Francis Crick Explanation: 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.
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