Evolution is the change in organisms over time that gives rise to new species. Development is the process by which a fertilized egg, or embryo, generates the cells, tissues, and organs of a new ...

Haeckel’s most influential idea was his now-infamous biogenetic law, summarized by the phrase “ontogeny recapitulates phylogeny”—in other words, an organism’s embryo progresses through stages of ...

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 ...

As they grow, the differences that will distinguish the embryos as adults become more and more apparent. The study of this development can yield insights into the process of evolution.

These observations suggest that the genetic programs responsible for embryonic development were already present before the emergence of animal life, or that C. perkinsii evolved independently to ...

A new study by Prof. Ariel Chipman of The Alexander Silberman Institute of Life Science at the Hebrew University of Jerusalem ...

Lamprey, a jawless vertebrate, is the most basal vertebrate amenable to experimental manipulation at embryonic ... in vertebrate evolution. Cerny, R, Cattell, M, Sauka-Spengler, T, Fraser, M, Yu, F, ...