What is the difference between a primary oocyte and a secondary oocyte ?
In pregnancy, mother egg cell is in prophase - $1$ in ovary primary oocyte is formed. In maturation, haploid primary oocyte transforms into haploid secondary oocyte by completing meiosis and meiosis completes and female gametes (ovum) is produced.
The immatured stage eggs are called as
$A$ - Acrosome possesses mitochondria.
$R$ -Middle piece of sperm is filled with enzymes
At the end of first meiotic division, the male germ cells differentiate into
In humans, at the end of the first meiotic division, the male germ cells differentiate into the
Identify $A, B, C, D$ and $E$ in given figure.