Sperms are released from the seminiferous tubules by the process called …..

Which of the following is not evident that the pattern of cleavage is determined by factors in the egg cytoplasm rather than by genes of zygote

Cleavage divisions differ from normal mitotic divisions in that

$A$ : Fertilin protein is present in the egg membrane.
$R$ : It helps in agglutination reaction

In embryonic stage RBC develops in