Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) The descendant (dashed) trajectory is a neotenic version of the ancestral (solid) one up to a point, then follows a new growth function. Note that this is not revealed by simply looking at the curves. (b) The dotted line is the image of the ancestor stretched along the time axis as in Fig. 4b. Comparing this with the dashed curve reveals the point at which the descendant is no longer just a slowed down version of its ancestor.
