What are allosomes?

In which one of the following,gametogenesis takes place only by mitosis?

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

While solving the problem of sex determination in a large number of insects,it was observed that

$A$ medical technician, while observing a human blood smear under the microscope, notes the presence of a Barr body close to the nuclear membrane in the $WBC$. This indicates that the person under investigation is:

Which one of the following conditions correctly describes the manner of determining the sex?