Question

Describe embryonic development upto the formation of blastocyst

Answer 1

Explanation:

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Answer 2

Answer:

Three days after the fertilization, a developing embryo will contain about 6-10 cells. By the fifth or sixth day, the fertilized egg is known as a blastocyst (a rapidly dividing ball of cells) .

Explanation:

Blastocyst

Blastocyst id the hollow cellular mass which is formed during the early development of embryo consisting of cells which forms trophectoderm, inner cell mass and fluid-filled cavity (blastocoel).

Embryonic development upto the formation of blastocyst are as follows:

• Cleavage is a phase in embryogenesis.
• In cleavage, a single-celled zygote is converted into a multicellular structure called as morula and then blastocyst.
• The very first cleavage division leads to the formation of 2-celled stage.
• 2, 4, 8, 16 daughter cells are formed which are called as blastomeres.
• During cleavage, zona pellucida is intact which retards the growth of blastomeres.
• The solid embryo with 8-16 blastomeres is known as a morula.
• The morula is then converted into blastocyst as it moves towards the uterus.
• Blastocyst is hollow ball of cells with outer trophoblast layer and inner cell mass. The central cavity is called as blastocoel.

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