Development of the zootype

Article Abstract:

Slack and his colleagues describe animals according to their zoo type, which they associate with Wolpert's theory of positional information. This system is explained in embryologists' belief that maternal structures are needed for understanding the zygotic genome. Embryologists opine that the egg structure provides the organism's basic structure, while Mendelian genes supplement features. The zootype explains the development in animals.

Research, Analysis, Records and correspondence, Embryology, Animal embryology, Zygotes, Zygote, Cohen, Jack

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Development of the zootype

Article Abstract:

Slack's claim that Hox genes are the defining characters for the Animalia has not been substantiated. It is also unclear whether any morphological innovation is necessarily the key to the radiation of the Animalia. The synapomorphies that hold the special status of key innovations can be identified by examining the relationship between all potential synapomorphies across a broad range of metazoan and non-metazoan taxa.

Identification and classification, Evolution (Biology), Evolution, Zoology, Animal taxonomy

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Knife-edge of design

Article Abstract:

Issues concerning the rate of biological reproduction are discussed. Particular attention is given to reproductive wastage illustrated by the fact that out of innumerable possibilities of reproduction only a small number of individuals reproduce.

Criticism and interpretation, Natural selection, Reproduction (Biology), Reproduction

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