Which allele combination represents a female who is a carrier for an X-linked recessive disorder?

The Correct answer would be  XRXr

Explanation:

In humans, X and Y are the sex chromosomes which determine the gender of the person.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.