Question

Which of the following is a wrong statement?

• A. Centromere is necessary for the movement of chromosomes to poles
• B. Uncontrolled mitotic division is the cause of cancer
• C. Endomitosis means duplication of DNA and chromosome along with nuclear division
• D. Tetrad stage of the chromosome is seen in prophase I of meiosis

Answer 1

The correct option is C Endomitosis means duplication of DNA and chromosome along with nuclear division

Endomitosis is the division or duplication of chromosomes without division of the nucleus. Endomitosis leads to polyploidy.

In metaphase, discontinuous fibres coming from two spindle poles get connected to the centromere surfaces or kinetochores of each chromosome. Later, the centromere of each chromosome divides and move to the opposite poles. Hence, centromere is necessary for the movement of chromosomes to poles.

In meiotic prophase I, homologous chromosomes pair up and each pair of bivalent is the association of four chromatids with two centromeres which is called tetrad.

Cancer is caused due to uncontrolled mitotic division of cells.