A couple has $6$ children-$5$ are girls and $1$ is boy. The percentage of having a girl on next time is
$10\, \%$
$20\, \%$
$50\, \%$
$100\, \%$
In man the normal number of chromosomes is
Which one of the following conditions correctly describes the manner of determining the sex?
Delete the odd one:
Initial clue about the genetic/chromosomal mechanism of sex-determination can be traced back to some of the experiments carried out in
What type of sex determination is observed in grass hopper ?