Question

describe development of embryo.​

Answer 1

Answer:

Embryonic development also embryogenesis is the process by which the embryo forms and develops.

1. The zygote divides repeatedly to make a ball of hundreds of cells.This is called an embryo.

2. The embryo gets embedded in the soft and thick lining of the uterus.This is called implantation.

3. When the embryo settles down in the uterus, the woman is said to have become pregnant. The embryo starts growing into a baby.

4. The cells of embryo begin to form specialised groups that develop into different tissues and organ of the baby.

5. The unborn baby remains an embryo in the first eight weeks of pregnancy.

6. The embryo continues to grow and develop in the uterus to form a baby.The embryo gradually develops body part such as hands, legs, head, eyes and ears.

7. An unborn baby in the uterus at the stage when all the body parts can be identified is called foetus.

8. A human embryo becomes a foetus after about eight weeks of pregnancy.

9. It takes 38 weeks from the fertilisation of eggs to the formation of fully developed baby.When the development of foetus into a baby is complete, the mother gives birth to the baby.

10. The fully formed baby comes out of mother’s body through vagina.

Answer 2

Answer:

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 fertilization of 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.