A DNA similarity of 75% between two organisms
A) suggests the organisms are closely related at the species level.
B) suggests the organisms are not closely related at all.
C) suggests the organisms may or may not be related.
D) means the GC content in both organisms is 45%.
E) means the GC content in one organism is 75% and 25% in the other.

Question

Quizplus · Accepted Answer

A DNA similarity of 75% between two organisms suggests they are closely related at the species level, as such a high level of similarity typically indicates a close evolutionary relationship. DNA similarity is used to infer phylogenetic relationships, and a similarity of 75% is significantly high, suggesting a close genetic relationship.

A DNA Similarity of 75% Between Two Organisms