Multi-celled embryos, light micrograph

Multi-celled embryos, light micrograph

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Credit: DR NAJEEB LAYYOUS/SCIENCE PHOTO LIBRARY

Caption: Multi-celled embryos. Light micrograph of embryos, each comprised of between 4 and 5 cells. The development of an embryo is called embryogenesis. In organisms that reproduce sexually, once a sperm fertilizes an egg cell, the result is a cell that has all the DNA (deoxyribonucleic acid) of the two parents (zygote). The zygote begins to divide by mitosis producing 2, 4, 6, 8 cells and so on, to form a multicellular organism. The zygote is called an embryo from the first cell division, up until the end of the 8th week, whereafter it is instead called a foetus.

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Keywords: 4-5 cells, beginning, biological, biology, cell, cell biology, cell division, cells, cytology, developing, development, developmental biology, diploid eukaryote, embryo, embryo-genesis, embryogenesis, embryology, embryos, human, human body, laboratory, life, light micrograph, light microscope, lm, mitosis, mitotic, multi-cell, multi-celled, multicellular organism, origin, people, person, reproduction, stage, start

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