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| Q. |
Which of the following events occurred first? |
| A. | DNA structure of genes was discovered by James D Watson and Francis Crick |
| B. | Yuri Gagarin became the first man in space |
| C. | World's first human heart transplant was performed by Dr. Christian Barnard |
| D. | World's first test tube baby Louise Brown was born in U.K. |
| Answer» A. DNA structure of genes was discovered by James D Watson and Francis Crick | |
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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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