In addition to demonstrating the evolution of gene control over tooth development, the hens' teeth study serves as an ...

Includes Malpighi's De formatione pulli in ovo (On the formation of the chick in the egg), v. 2, p. [932]-981; and his Appendix repetitas auctasque de ovo incubato observationes continens (Repeated ...

Embryological Concepts in the Twentieth Century -- Questions Posed by Classical Descriptive and Experimental Embryology -- Ross Harrison's Contributions to Experimental Embryology -- Analysis of ...

All vertebrate embryos follow a common developmental path due to their common ancestry. All have a set of very similar genes (the homeobox genes) that define their basic body plan. As they grow, the ...

Humans do not have tails, but do we have “what it takes” for a tail? Hens don’t have teeth, but they have the genes for it. With atavism, it is as if our genomes serve as archives of our evolutionary ...