zygotas
A zygote is the initial cell formed when two gametes (sex cells), such as a sperm and an egg, fuse during sexual reproduction. This fusion process, known as fertilization, results in a single diploid cell containing genetic material from both parents. The zygote is the very first stage of development for a new organism.
Following fertilization, the zygote undergoes a series of rapid cell divisions called cleavage. These divisions occur