CELL DIVISION
MEIOSIS AND GENETIC VARIATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True-All cells within living things must undergo mitosis to create new cells.
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False-Brain and nerve cells do not undergo mitosis to create new cells.
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Detailed explanation-1: -The reproductive cells or the sexual gametes-egg and sperm do not undergo the phenomenon of mitosis as they perform meiosis. The prokaryotic cells also do not exhibit mitosis and do not contain the structure needed for it. Therefore, all cells do not exhibit mitosis.
Detailed explanation-2: -While these connective tissue cells and epithelial cells can undergo mitosis and regenerate themselves upon damage or to replace the older ones, the main brain cells or the neurons cannot undergo mitosis.
Detailed explanation-3: -Neurons. Neurons, or nerve cells, carry out the functions of the nervous system by conducting nerve impulses. They are highly specialized and amitotic. This means that if a neuron is destroyed, it cannot be replaced because neurons do not go through mitosis.
Detailed explanation-4: -Nerve cells do not undergo cell division due to absence of centrioles which help in assembling of microtubules during the process of cell division. Nerve cells in fact develop from glial cells by the process of neurogenesis.