Final answer:
The false statement among the options given is option B, which states that X inactivation can still occur in a cell lacking the X Inactivation Center (XIC). Without the XIC, the X chromosome cannot be inactivated. Option B) In a cell with X chromosomes lacking the XIC, there is still X inactivation is a false statement.
Step-by-step explanation:
The student has asked which statement is false regarding Barr bodies and conditions related to sex chromosomes variations. After reviewing information on X chromosome inactivation and characteristics of various syndromes, we can determine the accuracy of each statement given in the question.
- A) A typical XX human female has one Barr body. - This is true because females have two X chromosomes, and one of them is inactivated to form a Barr body.
- B) In a cell with X chromosomes lacking the XIC, there is still X inactivation. - This is false because the X Inactivation Center (XIC) is essential for inactivating the X chromosome. Without it, the X chromosome cannot be inactivated.
- C) An individual with Turner Syndrome has no Barr bodies. - This is true because individuals with Turner Syndrome have only one X chromosome and therefore, there's nothing to inactivate.
- D) An individual with Klinefelter syndrome generally has one Barr body. - This is true because in Klinefelter syndrome (XXY), one of the X chromosomes is inactivated to form a Barr body.
Based on this information, the false statement is option B, as the presence of the XIC is necessary for X inactivation to occur.