All vertebrate embryos follow a common developmental plan due to having a set of genes that gives the same instructions for development. Embryos of all vertebrates have deep structural similarities and these deep similarities are said to clearly show evidence for evolutionary relationships. Animals in the phylum Chordata share four key features that appear at some stage during their development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and; a post-anal tail. For example, fish embryos and human embryos both have gill slits. Darwin’s theory of biological evolution noted that all vertebrates have gill slits and tails in early stages of embryo formation, even though these features may be lost or modified in … Reason for incorrect answer: Option a. is given as, “backbone.” Backbone is the property of vertebrates and all chordates are not vertebrates. MEDIUM. The so-called gill slits of a human embryo have nothing to do with gills, and the human embryo does not pass through a fish stage or any other evolutionary stage. So what makes a chordate, a chordate? Since Darwin's time, textbooks have reiterated that early embryos of many vertebrates, including humans, have tiny pouches that reflect an evolutionary fish stage. Embryos of many different kinds of animals: mammals, birds, reptiles, fish, etc. The most conspicuous and familiar members of Chordata are vertebrates, but not all have vertebrae. For example, all vertebrate embryos have "gill slits" which are not actually gills. The nerve cord, notochord, postnatal tail, and pharyngeal slits are the four characteristics that are present in the chordates. The development of the human embryo reveals steady progress toward a fully functional human body. The theory of recapitulation, also called the biogenetic law or embryological parallelism is often expressed in Ernst Haeckel's phrase as "ontogeny recapitulates phylogeny". According to the recapitulation theory, early human embryos have structures like gill slits, so, therefore, early human embryos represent the form of adult fish, which also have gill slits. Mayr is not claiming that human embryos actually have the gill slits of a fish. As chordates, all vertebrates have a similar anatomy and morphology with the same qualifying characteristics: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. D. Biogenesis. They connect the throat to the outside early in development but eventually close in many species; only in fish and larval amphibians do they contribute to the development of gills. The embryos of birds and mammals clearly show gill-like structures, more technically called pharyngeal arches. B. Organic evolution. More recently, embryologists … It becomes very difficult to differentiate between the embryos of a fish, and that of a bird, or embryo of a fish, and a human. Example: All vertebrates embryos have gill slits, which may become gills or ear bones. So, the embryo of all chordates does not have a backbone. The presence of gill slits in the embryos of all vertebrates supports the theory of. All vertebrate embryos follow a common developmental path due to their common ancestry. Explanation: According to embryology, all vertebrates exhibit similar traits and structures at their embryonic stage. The vertebrae and nervous systems develop early so all embryos appear to have a tail. German zoologist Ernst Haeckel is perhaps most famous for defending evolution with the argument that creatures replay their evolutionary past when developing in the womb. Like all chordates, vertebrates have a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. 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