Question

Since the DNA sequence determines a protein's amino acid sequence, a gene shared by two closely related organisms often haveA) very similar amino acid sequencesB) the exact same DNA sequencesC) different types of proteinsD) very different amino acid sequences

Answer 1

Two closely related organisms will have very similar DNA, which also means that a shared gene will produce very similar animo acid sequences, if not the same, because an aminoacid can be coded by more than one codon, so two slighly different DNA sequences can produce the same aminoacid sequence.

This means A, very similar amio acid sis the right answer.