Question
Explain the contribution of Alfred Sturtevant in ‘Chromosome mapping’.
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| S.No | Column I | S.No | Column II |
| A. | XO | 1. | Human male |
| B. | XX | 2. | Male bird |
| C. | XY | 3. | Male grasshopper |
| D. | ZZ | 4. | Female Drosophila |
| | | 5. | Female bird |