Question: 124: Which one of the following never occurs during mitotic cell division?
(1) Pairing of homologous chromosomes
(2) Coiling and condensation of the chromatids
(3) Spindle fibres attach to kinetochores of chromosomes
(4) Movement of centrioles towards opposite poles
Answer: Option (1)
Explanation:
Mitosis is a type of cell division in which a single cell divides to produce two genetically identical daughter cells.
Pairing of homologous chromosomes, also known as synapsis,
is a characteristic feature of meiosis I and does not occur during mitosis.
During prophase of mitosis, chromosomes undergo coiling and condensation,
so statement (2) does occur.
In metaphase, spindle fibres attach to the kinetochores of chromosomes to ensure proper alignment
and separation, so statement (3) occurs.
Centrioles move towards opposite poles during prophase and help in spindle formation,
making statement (4) a normal event of mitosis.
Therefore, pairing of homologous chromosomes never occurs during mitotic cell division,
and the correct answer is Option (1).