(A) The de novo inactivation model requires many rounds of inactivation and reactivation: the paternal germline initiates meiotic sex-chromosome inactivation, but the X chromosome is completely ...

One of Darwin's contemporaries, German biologist Ernst Haeckel, summed up the argument in a famous, pithy statement: "Ontogeny recapitulates phylogeny.'' That is to say, in the process of ...

et al. "A Juvenile Tuarangisaurus Keyesi Wiffen and Moisley 1986 (Plesiosauria, Elasmosauridae) from the Upper Cretaceous of New Zealand, with Remarks on Its Skull Ontogeny." Cretaceous Research ...

The time of fertilization represents the starting point in the life history, or ontogeny, of the individual." [Carlson, Bruce M. Patten's Foundations of Embryology. 6th edition. New York: McGraw-Hill, ...

Play is widespread, but far from ubiquitous, across the animal kingdom. Especially common in mammals, play is also known to ...

Overviews of ontogeny by taxon and anatomical region for numerous species supplement excellent anatomical studies. The volume couples careful and detailed description with insightful evolutionary and ...

American Zoologist 40, 748-758 (2000). Gould, S. J. Allometry and Size in Ontogeny and Phylogeny. Biological Review of the Cambridge Philosophical Society 41, 587 (1966). Gould, S. J. Geometric ...

The gray squirrel’s appearance differs seasonally. The yellowish brown summer coat becomes thicker and gray in winter, the pelage of some individuals strikingly silver-gray. Underparts and eye-rings ...

Wright, April Wagner, Peter J. and Wright, David F. 2021. Testing Character Evolution Models in Phylogenetic Paleobiology.

In addition, I study the ontogeny of characters to resolve long-standing homology issues and thus to get a better idea about the phylogenetic relationships of various groups. I have recently become ...

Physical cues in the womb, and not just genetics, influence the normal development of neural crest cells, the embryonic stem cells that form facial features, finds a new study led by UCL researchers.

The time of fertilization represents the starting point in the life history, or ontogeny, of the individual." [Carlson, Bruce M. Patten's Foundations of Embryology. 6th edition. New York: McGraw-Hill, ...