Question

Development of Human embryo.. Steps ☺☺☺​

Answer 1

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Development of human embryo

• There are many stages involved in the development of embryo.

• The unfertilized egg which is released from the ovary after fertilization forms a zygote. The single celled zygote divides to to form a spherical mass of cells called as the morula.

• The morula then divides to form blastocyst which is a hollow sphere with a surrounding single layer called as the trophoblast and cells are projecting from inside. The blastocysts gets fixed in the wall of the uterus.

• The three weeks old embryo appears to be a small organism. After five weeks heart and blood vessels are developed. After the course of eight week there is formation of limbs and the organisms start taking appearance of human being.

• An infant is born in the end after the completion of 40 weeks.

Answer 2

Answer:

The early stages of embryonic development begin with fertilization. ... After fertilization, the zygote undergoes cleavage to form the blastula. The blastula, which in some species is a hollow ball of cells, undergoes a process called gastrulation, in which the three germ layers form.Human embryonic development, or human embryogenesis, refers to the development and formation of the human embryo. It is characterised by the process of cell division and cellular differentiation of the embryo that occurs during the early stages of development