The undifferentiated primordial germ cells are larger in size and their chromatin rich nuclei are distinct in
Multiplication phase
Growth phase
Maturation phase
All the above
How many cleavages are completed in $16$ celled stage of egg.
Cleavage divisions differ from normal mitotic divisions in that
From the egg in gastrula stage if you remove all cells which form endoderm, the new organism will lack of
Foetal membranes provide
$A$ : In human, ovum is alecithal type.
$R$ : It is almost free of yolk