NEETZoologyPrinciples of Inheritance and Variation
Read the following statements carefully: (A) Failure of segregation of chromatids during cell division cycle results in the gain or loss of a chromosome(s), called aneuploidy. (B) Failure of cytokinesis after telophase stage of cell division results in aneuploidy. (C) Down's syndrome is an example of aneuploidy due to the addition of an extra copy of an autosome. (D) Turner's syndrome is an example of polyploidy due
Options
- AOne
- BThree
- CFour
- DTwo
Correct answer
D. Two
Step-by-step solution
Statement (A) is correct as aneuploidy is defined as the gain or loss of chromosomes due to the failure of segregation of chromatids during cell division. Statement (B) is incorrect because the failure of cytokinesis after the telophase stage results in an increase in a whole set of chromosomes, which is called polyploidy, not aneuploidy. Statement (C) is correct as Down's syndrome is caused by the presence of an additional copy of the chromosome number 21 (trisomy 21), which is an autosome. Statement (D) is incorr