Barr bodies (seen in saliva test in Olympic games) are found in humans and are associated with:

Where are the genes of incomplete sex linkage situated?

Usually,the recessive character is expressed only when present in a double recessive condition. However,a single recessive gene can express itself in human beings when the gene is present on

$A$ man affected by a certain disease marries a normal woman. They have $8$ children ($3$ daughters and $5$ sons). All the daughters suffer from their father's disease,but none of the sons are affected. What type of inheritance can you suggest for this disease?

In Barr body (sex-chromatin) of a normal female:

In which of the following is male heterogamety $NOT$ observed?