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Q: Polyploidy arises due to change in the
  • A. number of chromatids
  • B. structure of genes
  • C. number of chromosomes
  • D. structure of chromosomes
Correct Answer: Option C - An organism having more than two sets of homologous chromosomes is known as polyploid and the phenomenon is polyploidy refers to a numerical change in a whole set of chromosomes. Polyploidy may occurs due to abnormal cell division, either during mitosis, or commonly during metaphase I in meiosis.
C. An organism having more than two sets of homologous chromosomes is known as polyploid and the phenomenon is polyploidy refers to a numerical change in a whole set of chromosomes. Polyploidy may occurs due to abnormal cell division, either during mitosis, or commonly during metaphase I in meiosis.

Explanations:

An organism having more than two sets of homologous chromosomes is known as polyploid and the phenomenon is polyploidy refers to a numerical change in a whole set of chromosomes. Polyploidy may occurs due to abnormal cell division, either during mitosis, or commonly during metaphase I in meiosis.