McqMate
| Q. |
Which chromosomal combination is responsible for maleness in man? |
| A. | XO |
| B. | XXX |
| C. | XX |
| D. | XY |
| Answer» D. XY | |
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Explanation: In the XY sex-determination system, the female-provided ovum contributes an X chromosome and the male-provided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively. |
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