NEET2026BiologyChapterActual
Given below are two statements: Statement I: Down's syndrome and Klinefelter's syndrome are examples of aneuploidy, which occurs due to the failure of segregation of chromatids during the cell division cycle. Statement II: Polyploidy results from the failure of cytokinesis after the telophase stage of cell division and is a condition frequently observed in higher animals. In the light of the above statements, choose
Options
- ABoth Statement I and Statement II are correct
- BStatement I is correct but Statement II is incorrect
- CStatement I is incorrect but Statement II is correct
- DBoth Statement I and Statement II are incorrect
Correct answer
B. Statement I is correct but Statement II is incorrect
Step-by-step solution
Statement I is correct because aneuploidy is the phenomenon of gain or loss of one or more chromosomes due to the failure of segregation of chromatids during the cell division cycle. Down's syndrome (trisomy 21) and Klinefelter's syndrome (47, XXY) are classic examples of aneuploidy. Statement II is incorrect because while polyploidy does result from the failure of cytokinesis after the telophase stage of cell division, it is a condition frequently observed in plants, not in higher animals. Polyploidy is generally