Question

A zygote is formed from the fusion of a sperm and an egg. The zygote undergoes cell division during embryonic development. After four divisions, the zygote becomes a . Later, specialized cells in the embryo are derived from the .

Answer 1

A zygote is formed from the fusion of a sperm and an egg. The zygote undergoes cell division during embryonic development. After four divisions, the zygote becomes a morula.  After four divisions, the zygote becomes a . Later, specialized cells in the embryo are derived from the inner cell mass (ICM) of the blastocyst.

Answer 2

After four divisions, the zygote becomes a morula- the stadium that consists of 16 blastomeres. By the fifth day of development the form of the blastocyst is formed through the processes of compaction, cell division, and blastulation. Later, specialized cells in the embryo are derived from the inner cell mass (ICM) of the blastocyst.