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Get Answers to all your Questions
Which of the following statement are incorrect about anaphase I?
a. Separation of the homologous chromosomes takes place.
b. The centromeres of sister chromatids maintain their association.
c. Separation of the non-homologous chromosomes takes place.
4. The centromeres of non-sister chromatids maintain their association.
a and b
b and c
c and d
d and a
Answers (1)
Statement C is incorrect because it claims that anaphase I does not result in the separation of non-homologous chromosomes, which is untrue. Because to the collapse of chiasmata—the locations where genetic material was transferred between homologous chromosomes during crossing over in prophase I—and the shortening of microtubules connected to the kinetochores, anaphase I is characterised by the separation of homologous chromosomes.
Statement D is incorrect because during anaphase I, homologous chromosomes split and are pulled apart by the microtubules that are connected to them from the cell's opposing poles. The centromeres of non-sister chromatids are separated as a result of the division of homologous chromosomes. Hence option C is correct option.
Statement a is correct because homologous chromosomal separation characterises anaphase I. The chiasmata, or locations where homologous chromosomes exchanged genetic material during crossing over in prophase I, disintegrate during anaphase I, and microtubules attached to the kinetochores of each homologous chromosome shorten and pull the chromosomes in opposite directions towards the cell's poles. Hence option a and d are incorrect.
The centromeres of sister chromatids continue to be linked throughout anaphase I, proving that statement b is likewise true. This is due to the fact that each homologous chromosome's sister chromatids are still connected to one another at the centromere, and the microtubules from the spindle fibres are pulling each homologous chromosome in opposing directions while still maintaining their connection. The centromeres of each chromatid split during anaphase II, and the chromatids are tugged in opposing directions to form the sister chromatid separation. Hence option 2 is incorrect.
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