If the final segment ctc ctc ttc of the normal hemoglobin dna sequence underwent a point mutation to become ctc ctt ttc, would it affect the resulting protein?

The given mutation of the DNA segment ctc ctc ttc to ctc ctt ttc is a known type of mutation in the gene for beta-globin. The translated protein remains unchanged because both the CTT and CTC codons code for the amino acid glutamic acid. 

The answer is a because - is an direction

The short-term effect of tar on the body is increased blood pressure.