Number of Barr Bodies in XXXX female is
A. 1
B. 2
C. 3
D. 4
Hint: Barr bodies are the inactive X chromosomes found in individuals with more than one X chromosome, and their number is one less than the total number of X chromosomes present in the given illustration.
Complete answer:
To answer this question, it’s important to understand what a Barr body is. A Barr body is a small structure found in the nuclei of female cells. It consists of an inactive X chromosome in cells that contain more than one X chromosome. Thus, an individual with two X chromosomes will have one Barr body. For instance, females have the chromosome composition XX, resulting in the presence of one Barr body, while individuals with only one X chromosome, like males with XY chromosomes, have no Barr body.
The number of Barr bodies is determined by taking one less than the total number of X chromosomes present. In the case of a female with XX chromosomes, there will be one Barr body. Conversely, males, with their XY chromosomes, have zero Barr bodies.
In this particular question, we are asked about the number of Barr bodies in a female with four X chromosomes (XXXX). This means the Barr body count will be one less than the total number of X chromosomes. Since there are four X chromosomes in this female, the Barr body count will be three. Therefore, the number of Barr bodies in the XXXX female is 3.
Thus, the correct answer is option C, which is 3.
Note:Barr bodies are considered indicators of genetic femininity. The inactive X chromosome can be observed under a microscope, appearing as an irregularly shaped, darkly stained structure known as a Barr body. According to the question, females with XXXX chromosomes have three Barr bodies.