Thompson & Thompson Genetics in Medicine by Robert Nussbaum & Roderick R. McInnes & Huntington F Willard

Author:Robert Nussbaum & Roderick R. McInnes & Huntington F Willard [Nussbaum, Robert]
Language: eng
Format: epub
ISBN: 9780323392068
Publisher: Elsevier Health Sciences
Published: 2015-05-26T21:00:00+00:00

Figure 14-9 Human development begins with cleavage of the fertilized egg. A, The fertilized egg at day 0 with two pronuclei and the polar bodies. B, A two-cell embryo at day 1 after fertilization. C, A four-cell embryo at day 2. D, The eight-cell embryo at day 3. E, The 16-cell stage later in day 3, followed by the phenomenon of compaction, whereby the embryo is now termed a morula (F, day 4). G, T formation of the blastocyst at day 5, with the inner cell mass indicated by the arrow. Finally, the embryo (arrow) hatches from the zona pellucida (H). See Sources & Acknowledgments.

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