Indicate the expected number of Barr bodies in interphase cells of individuals with Klinefelter syndrome; Turner syndrome; and karyotypes 47,XYY, 47,XXX, and 48,XXXX.

Verified step by step guidance

1. Understand that a Barr body is an inactivated X chromosome in a cell with more than one X chromosome.
2. Recall that the number of Barr bodies is calculated as the total number of X chromosomes minus one.
3. For Klinefelter syndrome (47,XXY), calculate the number of Barr bodies by subtracting one from the number of X chromosomes.
4. For Turner syndrome (45,X), note that there is only one X chromosome, so calculate the number of Barr bodies accordingly.
5. Apply the same calculation method for karyotypes 47,XYY, 47,XXX, and 48,XXXX, considering the number of X chromosomes in each case.

Key Concepts

Barr Bodies

Barr bodies are inactivated X chromosomes found in the cells of individuals with more than one X chromosome. In females, typically one X chromosome is active while the others are condensed into Barr bodies. This process is crucial for dosage compensation, ensuring that gene expression levels are balanced between males and females.

Klinefelter Syndrome

Klinefelter syndrome is a genetic condition in males characterized by the presence of an extra X chromosome, resulting in a karyotype of 47,XXY. Individuals with this syndrome typically have one Barr body in their interphase cells, as one X chromosome is inactivated while the other remains active.

Turner Syndrome

Turner syndrome occurs in females who have only one X chromosome, resulting in a karyotype of 45,X. Since there is only one X chromosome present, there are no Barr bodies in interphase cells, as there are no additional X chromosomes to inactivate.