Genetic testing can be used to tell if a person carries mutation of the CF (cystic fibrosis) gene. The test looks at a person's DNA, which is taken from cells in a blood sample or from cells that are gently scraped from inside the mouth.
Extra fact: More than 10 million Americans are carriers of one mutation of the CF gene.
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If the personal isn't organized and running behind schedule
<span>B is the correct answer. Infancy typically refers to the period immediately after birth until a young human starts walking, from which point 'toddler' becomes the term - referring to their way of walking. During toddlerhood, young humans get more confident walking and start choosing other methods of movement, for example skipping. They also start to learn simple concepts like shapes, colours, and so on. Early childhood encompasses both infancy, toddlerhood and later years after toddlerhood - this is, therefore, also a correct answer. </span>
