Fertilization is depicted by the condition
$n \to 2n$
$2n \to 3n$
$2n \to 4n$
$4n \to 8n$
When sex is determined at the time of fertilization, it is known as
Find $A$ to $D$ in figure
In which stage of development the embryonic cells form the germinal layers by the movement
Fraternal twins in man are produced when
A sperm without acrosome, cannot