Question

Select the incorrect statement with respect to the cell cycle.

• A. Duplication of genes occurs twice in meiosis
• B. Karyokinesis occurs twice during meiotic division
• C. Cyclins are proteins that activate protein kinases to regulate the cell cycle
• D. At the end of telophase-I, chromosome number is reduced to half

Answer 1

The correct option is A Duplication of genes occurs twice in meiosis

Duplication of genes occurs once in meiosis. The cell undergoes meiosis-I and meiosis-II after the genetic material is already duplicated in the S-Phase of the interphase.

Karyokinesis occurs once in mitosis and twice in meiosis.

Cyclin-dependent kinases are the protein kinases that were first discovered for their role in regulating the cell cycle. They are also involved in regulating transcription, mRNA processing, and the differentiation of nerve cells.

During telophase-I, the chromosomes are enclosed in the nuclei.
The cell now undergoes a process called cytokinesis that divides the cytoplasm of the original cell into two daughter cells. Each daughter cell is haploid and has only one set of chromosomes, or half the total number of chromosomes of the original cell.