During fertilization, which centriole of the sperm gives rise to a spindle system inside the egg
Proximal centriole
Distal centriole
Ring centriole
None of the above
Sertoli cells are regulated by the pituitary hormone known as
The number of foetal membranes in man is
Function of allantois in mammal is
Study the flow chart. Name the hormones labelled as $A, B, C, D$ at each stage.
$A \quad B\quad C \quad D$
$A$ : In frog gray cresent is formed during fertilization.
$R$ : It is because the black granules move towards the point of entry of the sperm in animal half