What is the chromosomal makeup of a female organism?

The chromosomal makeup of a female organism is represented by two X chromosomes, which is designated as XX. In most species, including humans, the presence of two X chromosomes typically determines the female sex. This genetic configuration arises because females inherit one X chromosome from each parent, resulting in an XX pair.

The significance of this chromosomal arrangement lies in its role in the development and functioning of biological sex traits. The X chromosome carries numerous genes that are involved in various bodily functions and traits, contributing to the overall phenotype of the female organism.

In contrast, the alternatives provided do not accurately represent the chromosomal makeup of females. XY, for instance, is the chromosomal configuration characteristic of male organisms in many species, including humans. YY and XYX do not correspond to typical chromosomal configurations found in the biological sex determination of organisms. Therefore, the XX configuration uniquely defines the chromosomal makeup of female organisms, clarifying why it is the correct answer.