What is meant by molecular drive? Explain its significance in evolution giving suitable examples. (UPSC 2017, 15 Marks, )

'आणविक ड्राइव से क्या तात्पर्य है? उपयुक्त उदाहरण देते हुए विकास में इसके महत्व की व्याख्या करें।' (What is meant by molecular drive? Explain its significance in evolution giving suitable examples.)
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Introduction
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Discuss the role of molecular techniques in the study of contemporary systematics. (UPSC 2019, 15 Marks, )

समकालीन प्रणालीविज्ञान के अध्ययन में आणविक तकनीकों की भूमिका पर चर्चा करें। (Discuss the role of molecular techniques in the study of contemporary systematics.)
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Introduction
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