In which organism is the female homogametic and possesses one chromosome more than the male?

Given below are two statements.
Statement $I$ - $X$ Chromosome has a large amount of euchromatin and a small amount of heterochromatin.
Statement $II$ - The homologous region of the $X$ Chromosome contains a smaller number of genes than the $Y$ Chromosome.
In the light of the above statements,select the correct option given below:

Number of autosomes in a normal human female is

The Barr body is observed in

The genic balance theory of sex determination in $Drosophila$ was proposed by:

In which of the following organisms is female heterogamety observed?