Gapfilling quiz

Fill in all the gaps by dragging the words in the top bar to their correct places.
Correct answers will appear in green and incorrect answers will appear in red.
lncorrect answers may be corrected by dragging the correct word to its place in the paragraph.
   colour      development      environment      exercise      food      Genes      genetic      proteins      tissues   

are like blueprints for building a house, except that they carry the plans for building cells, and organs.
They have the instructions for making the thousands of chemical building blocks, called in the body.
Differences in genes cause individuals to have different traits such as hair , blood type or skin colour.
A gene gives only the potential for the of a trait.
How this trait develops depends partly on the .
For example, a person may have a tendency toward being overweight.
But the person's actual weight will depend on such environmental factors as to what kinds of the person eats and how much that person does.