Amutation results in an organism that lacks the ability to make one amino acid .what is true of this organism ?
a. the organism's ability to rna has been changed
b. a gene has undergone a change in the organisms dna
c. ribosomes in the organism do not function properly
d. all the above

The correct answer is-

b. a gene has undergone a change in the organisms DNA.

DNA ( deoxyribonucleic acid) contains instructions for protein synthesis in the form of codons ( a sequence of three nucleotides), which code for particular amino acid. DNA is converted to mRNA ( through transcription), which is then converted to proteins ( through translation).

As per the question, a mutation in an organism has lacked the ability to make ( incorporate) one amino acid.

This means that there is a change in the codon ( that is change in the gene) in a manner such that now the mutated codon will not code for any amino acid.

Thus, option b) is the right answer.

as in mitosis, dna replication occurs during interphase.   in meiosis, it occurs specifically in s phase of interphase 1.