In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosomes is/are: i. large chromosome ii. small chromosome iii. Y chromosome iv. X chromosome

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(iii) and (iv) Explanation: In human males, there are 23 pairs of chromosomes. Of these, 22 pairs are autosomes and are perfectly matched in size and shape. The 23rd pair consists of the X and Y chromosomes. Since the X chromosome is large and the Y chromosome is much smaller, they are not perfectly paired. Therefore, the unpaired chromosomes are the X and Y chromosomes.

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