Ключевые слова: amnion, blastocyst, cell, chromosome, cleavage, development, developmental, differentiation, division, embryo, embryonic, fallopian, fertilization, follicle, gametes, genetic, germ, growth, implantation, layers, maturation, meiosis, mitosis, morula, nucleus, oocyte, ovulation, placenta, pregnancy, process, secondary, stages, tube, uterus, zygote,