Question

If an error in transcription causes the last cytosine in an mRNA sequence that was supposed to read UUG AUC CAA UGC to be replaced with a guanine, which of the following do you predict would happen?

Answer 1

If the last cytosine is replaced by a guanine, the last amino acid will become tryptophan instead of cysteine.

UUG AUC CAA UGC.

UUG AUC CAA UGG.

This type of mutation that changes the amino acid is called missense mutation.

In humans, mutations of this type are responsible for diseases such as sickle cell disease. In plants, false sense mutations control, for example, the thickness of the hull of the oil palm fruit.

Answer 2

The first amino acid in the chain will be glycine instead of arginine would be predicted to happen.