Embryo drawing refers to any representation of the illustration of embryos in their developmental sequence. In plants and animals, an embryo develops from a zygote, the single cell that results when an egg and sperm fuse during fertilization. In animals, the zygote divides repeatedly to form a ball of cells, which then forms a set of tissue layers that migrate and fold to form an early embryo. Images of embryos provide a means of comparing embryos of different ages, and species. To this day, embryo drawings are made in biology undergraduate developmental biology lessons.
Comparing different embryonic stages of different animals is a tool that can be used to infer relationships between species, and thus biological evolution. This has been a source of quite some controversy, both now and in the past. Ernst Haeckel pioneered in this field. By comparing different embryonic stages of different vertebrate species, he formulated the Recapitulation theory. This theory states that an animal's embryonic development follows exactly the same sequence as the sequence of its evolutionary ancestors. Haeckel's work and the ensuing controversy linked the fields of developmental biology and comparative anatomy into comparative embryology. From a more modern perspective, Haeckel's drawings were the beginnings of the field of evolutionary developmental biology (evo-devo).
The study of comparative embryology aims to prove or disprove that vertebrate embryos of different classes (e.g. mammals vs. fish) follow a similar developmental path due to their common ancestry. Such developing vertebrates have similar genes, which determine the basic body plan. However, further development allows for the distinguishing of distinct characteristics as adults.
Read more about Embryo Drawing: Use of Embryo Drawings and Photography in Contemporary Biology, Controversy, Opposition To Haeckel, Haeckel's Proponents (past and Present), The Survival and Reproduction of Haeckel's Embryo Drawings
Other articles related to "embryo drawing, embryo drawings, embryos":
... Haeckel's embryo drawings, as comparative plates, were at first only copied into biology textbooks, rather than texts on the study of embryology ... program in comparative embryology virtually collapsed after the First World War, his embryo drawings have often been reproduced and redrawn with increased ... human embryology nor developmental biology are concerned with the comparison of vertebrate embryos ...
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