The normal sex chromosomes of a human female are denoted by "XX". To determine the correct answer, let's look at each notation provided:
1. XXY: This represents Klinefelter syndrome, a condition where a male has an extra X chromosome. It is not the normal chromosome notation for females.
2. XX: This is the correct notation for a normal human female, who has two X chromosomes.
3. XO: This is a notation sometimes used to describe Turner syndrome, a condition where a female is missing part or all of one X chromosome. This is not the normal chromosome notation for females.
4. XXX: This represents a condition known as Triple X syndrome, where a female has an extra X chromosome. While these individuals are typically female, this is also not the normal chromosome notation for females.
Given the options, the correct notation for the normal sex chromosomes of a human female is:
Q0) XX
Therefore, the answer is Q0) XX.
