Certificate In Psychology (CPSY) Practice Exam

What is the process called that transforms the zygote into a blastocyst?

1. Meiosis

2. Implantation

3. Cleavage

4. Zona pellucida formation

The correct answer is: Cleavage

The process that transforms the zygote into a blastocyst is called cleavage. Cleavage refers to a series of rapid cell divisions that occur shortly after fertilization. During this process, the single-celled zygote divides multiple times without increasing in size, resulting in a solid ball of cells known as a morula. As these divisions continue and cells become smaller, the morula develops into a blastocyst, which consists of an inner cell mass that will eventually form the embryo and an outer layer of cells known as the trophoblast that will contribute to the placenta. This process is crucial as it sets the stage for implantation into the uterine wall, allowing for further development and growth of the embryo.