Final answer:
The correct genotype for a female carrier of a recessive sex-linked trait is XcX. She has one normal X chromosome and one with the recessive gene without expressing the trait.
Step-by-step explanation:
The correct GENOTYPE for a female who is a carrier for a recessive sex-linked trait is C) XcX. In human genetics, males have one X and one Y chromosome (XY), while females have two X chromosomes (XX). For a female to be a carrier, she must have one normal X chromosome and one X chromosome with the recessive gene (Xc). If the female had two X chromosomes with the recessive gene (XcXc), she would express the trait. Carrier females typically do not exhibit symptoms because they have one normal X chromosome that compensates for the recessive gene on the other X chromosome. Such females are heterozygous for the trait, having one recessive allele (Xc) and one dominant allele (X).