Answer and explanation

Correct answer: A. A cell becoming specialised by using some genes

  1. Step 1: All body cells contain the same genes.
  2. Step 2: Differentiation is the expression of certain genes so that the cell takes on a particular structure and function.
Answer
A cell becoming specialised by using some genes.
Why not the others: The splitting of a cell into two identical cells: this is mitosis. The fusion of two gametes: this is fertilisation. The loss of DNA from a cell: cells keep their genes.

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What is cell differentiation? | Scottish Highers