Question

Which chromosome is lost during cell division
A. Giant chromosome
B. Acentric chromosome
C. Polycentric chromosome
D. Telocentric chromosome

Answer 1

Hint: These are the names given to different chromosomes. By its name, we can draw a conclusion of its structure. Chromosome is a structure made up of proteins in which the genetic material DNA is present and is found inside the nucleus. Cell division is the process where a cell is divided into daughter cells and is marked by different stages accordingly.

Complete answer:
Now, let us know the relation between chromosomes and cell division. Cell division includes two stages namely karyokinesis and cytokinesis. Karyokinesis is the division of the nucleus and occurs in four stages called prophase, metaphase,anaphase and telophase. In prophase, chromosomes are formed by condensation of chromatin and DNA. In metaphase, chromosomes are oriented towards the centre of the cell that forms an equatorial plate. In anaphase, the spindle gets attached to the centromere by which the chromosomes move to the opposite poles. The last stage is telophase where the chromatin loses its identity and begins to uncoil. Now, cytokinesis occurs which is the division of cytoplasm. In the Acentric chromosome, centromere is not present and hence the spindle is not attached to the centromere in the anaphase and hence it is lost during cell division.

Hence the correct answer is option B.

Note:
Giant chromosome is the largest one where many DNA replications occur but the cell does not divide. Polycentric chromosomes have many centromeres whereas in telocentric chromosomes, the centromere is present towards the terminal end. Based on the position of the centromere, chromosomes are divided into metacentric, submetacentric, acrocentric and telocentric.