Question

a part of an mRNA has the sequence CCG. Which change to this sequence would indicate a missense mutation?
A. CCA
B. CCA
C. CCU
D. CGG

Answer 1

The codon CCG codes for Proline....just like A, B and C (A and B are the same so perhaps a typo)....all these codons (CCA, CCU, CCG and CCC) code for proline. The one that doesn't code for proline is the last one (D), CGG - this one codes for tryptophan.

You can check these on a codon table.

So your answer is D. CGG

Answer 2

CCG conversion into CGG leads to the formation of another amino acid, thus option D is correct.

What do you mean by missense mutation?

A genetic change in which a single base pair substitute changes the genetic code in such a way that an amino acid other than the usual amino acid at that site is produced.

All of these codons (CCA, CCU, CCG, and CCC) code for proline, just as A, B, and C . The last one (D), CGG, does not code for proline; instead, it codes for tryptophan.

Learn more about mutation here:

https://brainly.com/question/14029401

#SPJ2