Meroblastic cleavage refers to which type of division of egg?

After implantation,which of the following events occurs?

$A$: Every cell of the body contains the same genetic material as the zygote. $R$: The zygote is formed by the fusion of male and female gametes.

Fertilization is defined as:

Which part of the sperm enters the ovum during fertilization in humans?

The extra-embryonic membranes of the mammalian embryo are derived from: