Final answer:
A zygote is formed as a result of fertilization, which is the union of a sperm and an egg. The formed zygote then undergoes cell divisions before implanting in the uterus.
Step-by-step explanation:
A zygote forms as a result of fertilization, which is the process where a haploid sperm and a haploid egg come together. This event results in a single diploid cell known as a zygote. After this, the zygote undergoes multiple cell divisions known as cleavage while traveling towards the uterus. The cluster of cells is first referred to as a morula and soon develops into a blastocyst. Only after these developments does the blastocyst undergo the process of implantation in the lining of the uterus. Therefore, the correct answer to the question is (c) fertilization.
Fertilization is the process in which a sperm and egg fuse to form a zygote. This occurs in the Fallopian tube and is enabled by processes such as chemotaxis, adhesion, and digestion. The zygote then undergoes cleavage, blastulation, and implantation before developing into an embryo.