Blastula and Blastomere Formation Quiz

The blastocyst is a structure formed in the early embryonic development of mammals. It is a form of blastula that develops from a berrylike cluster of cells called the ______.

It forms following the development of the blastula from the ______, which is made up of hundreds of cells created by cleavage.

Implantation, also known as nidation, is the stage in the embryonic development of mammals in which the blastocyst hatches, attaches, adheres, and invades the wall of the female's ______.

The embryo that performs the implantation is in the ______ stage, which is reached between 5 and 6 days after fertilization.

Gastrulation is a cellular reorganization process that includes the migration, invagination, and ______ differentiation.

The chorion is an extraembryonic membrane that surrounds the embryo in mammals, birds, reptiles, and ______.

In mammals, fertilization is the union of two germ cells, the male sperm and the female egg (ovum), through which the number of somatic chromosomes is restored and the progeny bear traits from both ______.

Unlike external fertilization, which occurs when sperm and egg meet outside the parent's body, internal fertilization occurs in the protected environment of the oviduct's ______ in mammals.

Prior to fertilization, sperm and eggs must undergo a number of processes, including extensive transcription and translation, architectural rearrangements and modification of existing organelles, production of new organelles, meiotic maturation and ______, and other processes.

The phase of rapid mitotic cell divisions that follow fertilization is known as ______.