Question

Embryogenesis- Write short notes.

Answer 1

Embryonic development also embryogenesis is the process by which the embryo forms and develops. In mammals, the term refers chiefly to early stages of prenatal development, whereas the terms fetus and fetal development describe later stages.

Embryonic development starts with the fertilizationof the egg cell (ovum) by a sperm cell, (spermatozoon). Once fertilized, the ovum is referred to as a zygote, a single diploid cell. The zygote undergoes mitotic divisions with no significant growth (a process known as cleavage) and cellular differentiation, leading to development of a multicellular embryo.

Although embryogenesis occurs in both animal and plant development, this article addresses the common features among different animals, with some emphasis on the embryonic development of vertebrates and mammals.

Answer 2

So long as the developing animal is inside the egg, it is called as embryo. Therefore, the term Embryogenesis or Embryogeny may be defined as formation and development of embryos. It includes all the changes by which a fertilized egg is transformed into an adult.....