Conquer the Kaplan Nursing Entrance 2025 – Prep, Practice, and Prosper!

The classification group that shows more genetic similarity among its members is at the level of class. Organisms within a class are more closely related to each other than those grouped in higher taxonomic categories like kingdom or phylum.

When comparing taxonomic levels, organisms classified within the same class share a more recent common ancestor, resulting in a greater degree of genetic similarity. For instance, within the animal kingdom, the class Mammalia includes all mammals that share distinct characteristics such as hair and mammary glands, reflecting closer genetic ties.

In contrast, higher taxonomic categories such as kingdom and phylum encompass a broader range of organisms that may have significant differences in their genetic makeup. For instance, the animal kingdom includes all animals, while the phylum level could categorize animals with very different body structures and functions, leading to decreased genetic similarity among those members.

Thus, when considering levels of classification, class provides a more specific grouping that highlights closer genetic relationships among its members compared to kingdoms and phyla.