Question

If diploid chromosome number is 12, then monosomic number of chromosome will be

• A. 6
• B. 12
• C. 11
• D. 13

Answer 1

Answer: (C)

11

Aneuploidy is the presence of an abnormal number of chromosomes in the cell. It is a type of numerical abbreviation of the chromosome. The failure of the chromosome to separate during the anaphase of meiosis and mitosis is the main cause of aneuploidy. Monosomics are those aneuploids in which one complete chromosome is lost (2n-1). They arise due to loss of a single chromosome from a diploid plant. 2n in the given cell is 12. 2n-1 is equal to 11.

So, the correct answer is option C.