Fertilisation of an egg cell it means......
$(1)$ End of process of oogenesis
$(2)$ Induces the completion of the second meiotic division
$(3)$ The corpus luteum degenerates
$(4)$ Signals for maintain progesterone level in blood
$(5)$ Formation of zygote
When sex is determined at the time of fertilization, it is known as
Gastrulation is the process which involves the differentiation of the following layers in a vertebrate embryo
Find $A$ to $D$ in figure
Normally the number of chromosomes in the nuclei of gametes that fuse at fertilization are