Question

question 65
in a comparison of dna between two species, maximum homology and relatedness is indicated if __.
a 100% of the dna is the same in both coding and noncoding regions.
b 100% of the amino acids are the same.
c 100% of the noncoding regions are the same.
d 100% of the dna is the same in the coding region of a gene.
e 100% of the bases are a, t, g, and c.

Explanation:

To determine the correct answer, we analyze each option:

• Option A: DNA homology (similarity) between species is assessed by comparing both coding (genes) and non - coding regions. If 100% of DNA in both regions is the same, it shows maximum relatedness as it includes all genetic material.
• Option B: Amino acids are related to protein translation from coding DNA. Comparing amino acids doesn't account for non - coding DNA, so it's not a full measure of DNA homology.
• Option C: Only non - coding regions are considered, ignoring coding regions which are crucial for gene function and species relatedness.
• Option D: Only coding regions are considered, ignoring non - coding regions which also have evolutionary and functional significance.
• Option E: All DNA has A, T, G, C bases. This is a universal property of DNA, not a measure of homology between species.

Answer:

A. 100% of the DNA is the same in both coding and noncoding regions.