Which of the following is an example of a vestigial organ in humans?
A. Appendix
B. Heart
C. Lung
D. Kidney
Answer: Option A
Solution (By JKExamLibrary)
The vermiform appendix is a vestigial organ, reduced in size and function, serving no essential digestive role in humans. Other vestigial structures include wisdom teeth, ear muscles, and coccyx. They are remnants of organs that were functional in ancestors, providing evidence for evolution. Heart, lung, and kidney are vital functional organs.
Explanation:
The ureter is a muscular tube that carries urine from the renal pelvis of each kidney to the urinary bladder by peristalsis. The urethra carries urine from the bladder to the exterior. Renal pelvis collects urine from calyces, nephron is the functional unit.
Explanation:
Meiosis is characterized by two successive divisions producing haploid gametes, and involves genetic recombination through crossing over during prophase I. Mitosis produces identical diploid cells with one division. Crossing over and independent assortment generate genetic variation. Therefore, crossing over is unique to meiosis.
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