Question

complete the table to describe the cells of a zygote, embryo, and fetus.
number of cells contains differentiated cell(s)?
fetus
zygote
embryo
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Explanation:

• A zygote is a single - celled structure formed by the fusion of sperm and egg. So, the number of cells is 1 and it does not contain differentiated cells as differentiation has not yet occurred.
• An embryo is formed from the zygote through cell division. It has multiple cells (more than 1 but less than a fetus) and during embryonic development, some initial cell differentiation starts to occur.
• A fetus has a large number of cells (much more than an embryo) and contains many differentiated cell types as it has undergone extensive development and organ - formation.

Answer:

	Number of cells	Contains differentiated cell(s)?
zygote	1	No
embryo	Multiple (more than 1, less than fetus)	Yes (initial differentiation)