Holandric genes are

Barr body in mammals represents

In which type of sex determination do both male and female have the same number of chromosomes?

The $Barr$ body is associated with which of the following?

Example$(s)$ of environmental determination of sex is/are:

$A$ fruit fly is heterozygous for a sex-linked gene. It is crossed with a normal female fruit fly. The specific chromosome for the male enters the egg in the ratio of ............. (in $: 1$)