Delete the odd one:
$XO$ - Type
$XY$ - Type
$ZW$ Type
$OY$ - Type
A family has five girls and no son. Probability of son as the $6^{th}$ child will be
In man the normal number of chromosomes is
$A$ : $XO$ type sex determination is found in large number of insects.
$R$ : Some of the sperms bear the $X-$chromosome whereas some do not
How is sex determined in Honey bee ?
$X$ -chromosome or $X$ - body was first observed by.............