How do some cells become brain cells and others become skin cells when the DNA IN ALL the cells is exactly the same. In other words, if the instructions are exactly the same how does one cell become a brain cell and another a skin cell?

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a chair, a bed, and a toothbrush

explanation:

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the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.