Select the $INCORRECT$ statement.

Determination of sex of a child depends upon

$A$ 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?

What type of sex determination is observed in grasshoppers?

The theory where the ratio between the number of $X$-chromosomes and the number of complete sets of autosomes determines the sex is known as:

In an organism,the sex determination ratio is given by $X/A = 1.5$. Then the organism becomes.....