NEET 2007 Biology question

Differentiation of organs and tissues in a developing organism, is associated with:

(1)Deletion of genes
(2)Developmental mutations
(3)Differential expression of genesCorrect
(4)Lethal mutations

Answer: (3)

Solution

All somatic cells of an organism are derived from the zygote by mitosis and carry the same set of genes. Cells differentiate into different tissues and organs because different genes are expressed (switched on or off) in different cells at different times, i.e.

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Question ID VK-089818