The primordial germ cells make their appearance from wall of
Amnion
Chorion
Allantois
Gonad
It's Obvious
Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?
The blastopore develops into future
Which of the following depicts the site of impantation of blastocyst under normal condition?
Umbilical cord in mammals, contains
Phallic organs in cockroach are related to
