Question

If three Barr bodies are observed in a mammal, the individual must possess

a) Turner syndrome
b) Klinefelter syndrome
c) Triple X syndrome
d) Down syndrome

Answer 1

If three Barr bodies are observed in a mammal, it indicates that the individual most likely possesses Triple X syndrome (XXX syndrome). Triple X syndrome is characterized by the presence of an extra X chromosome in females, resulting in individuals with three X chromosomes (XXX) instead of the typical two.

Step-by-step explanation:

If three Barr bodies are observed in a mammal, it indicates that the individual most likely possesses Triple X syndrome or XXX syndrome. Triple X syndrome is characterized by the presence of an extra X chromosome in females, resulting in individuals with three X chromosomes (XXX) instead of the typical two. It is a form of aneuploidy, a condition in which there is an abnormal number of chromosomes.

In individuals with Triple X syndrome, every X chromosome except one undergoes inactivation, forming Barr bodies in each cell nucleus. Barr bodies are compact structures formed by the inactivated X chromosome.

To recap, if three Barr bodies are observed in a mammal, the individual is most likely affected by Triple X syndrome.