Division of cells in the early embryo

Division of the zygote into germ layers

Growth of the cell cytoplasm and organelles

DNA replication

Blastula

Morula

Gastrula

Zygote

All of these

Monozygotic twins

Conjoined twins

Mosaicism

Tetraploidy

Sphere of cells surrounding a blastocel

Solid ball of cells within the zona pellucida

Precursor to the morula

Structure that gives rise to embryonic cleavage

Phase during embryogenesis in which a single-layered blastula is reorganized into a three-layered structure

Phase during embryogenesis when the embryo implants into the uterine lining

Phase during embryogenesis in which multiple rapid mitotic divisions occur

Phase during embryogenesis in which the single-layered blastula is reorganized into a solid ball of cells

Cleavage

Gastrulation

Implantation

Neurulation

Blastula

Gastrula

Morula

Zygote

It results in multiple cells that are each the same size as the original cell

It is the first step of embryogenesis after fertilization

It leads to multiple tiny cells, whose volumes all add up to the original cell size

Cleavage occurs regardless of the sex of the fetus

Cleavage happens rapidly after fertilization, but does not continue indefinitely

Gives rise to the embryo

Cells that form the outer layer of the blastula

Gives rise to the placenta

Secretes factors to make the blastocoel

The gastrula

The blastocyst

The morula

The neurula