Human fertilization

Embryonic Development Every species undergoes embryonic development in a different way. In general, genes code for specific synthesis of proteins that determine what organs and systems will be composed. However, all species differentiate types of cells in different ways, which can include an uneven distribution of cytoplasmic determinants (can activate genes to differentiate between types of cells.) Additionally, the differences in cells are based on their location in the developing embryo. These two tactics lead to cell differentiation where cells become different types as well as morphogenesis or the way an animal takes shape.