The chromosomal theory of sex determination was propounded by:

Describe the haplo-diploid sex determination system.

If the $X/A$ ratio of two Drosophila individuals is $0.6$ and $0.33$ respectively,what will be their sex?

$A$ man receives his $X$ chromosome from

$XO$ type of sex determination can be found in:

$A$ 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?