What type of sex determination is observed in grass hopper ?
$XX -XY$ type
$XX -XO$ type
$ZZ -ZW$ type
$ZZ -ZO$ type
Determination of sex of a child depends upon
Initial clue about the genetic/chromosomal mechanism of sex-determination can be traced back to some of the experiments carried out in
Bird females have chromosome arrangement as
$X$ -chromosome or $X$ - body was first observed by.............
Two different types of gametes in terms of the sex chromosomes, are produced by