G-------____ T------- ____ A------- ____ A------- ____ C------- ____ T ------- ____ C------- ____

1. To the right, is a half of a section of DNA that has been split apart and is ready to copy itself. Write the correct base in the space provided to build the DNA’s new strand. G-------____ T------- ____ A------- ____ A------- ____ C------- ____ T ------- ____ C------- ____ DNA & Mutations • 4) When mutations occur in DNA, they can change the information that DNA carries. To understand, look at the sentence below, which only uses three-letter words. • AMY GOT THE RED HOT POT OFF THE LOG • If one letter is deleted from this sentence it becomes: • AMY GTT HER EDH OTP OTO FFT HEL OG • Describe what happened to make this mutation. • 5) Write your own sentence with only three-letter words. • Now: Make just one change to your sentence. • Is the change (mutation) in your sentence, harmful, helpful or neither. Explain. 2) Below are two sequences – an original and a sequence after TWO mutations. Circle the mutations, and describe what occurred. C G T A C G A T C G T A A T G C C G T A C G A T C C T A A G G C Original DNA Mutated DNA 3) When making proteins DNA is copied using uracil (U) instead of thymine (T). C G T A C G A T C G T A A T G C C G T A C G A U C G T A A U G C Circle the differences between the two strands. Original DNA DNA for protein