[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Genetic Reversals

In a message dated 95-12-20 10:14:21 EST, Thomas_R_HOLTZ@umail.umd.edu (th81)

>I think you are talking about Dollo's Law, but that is pregenetic (i.e., was
>developed long before genetics was understood).
>However, genetics has shown that Dollo was incorrect.  The genome retains
>for a very, very, very long period of time the sequence (or at least parts
>of the sequence) for features long since vanished in the phenotype.

Usually, during vestigialization the genes for encoding the particular body
part are suppressed by other genes, not eliminated from the genome. The point
of Dollo's Law is that when a body part is lost through vestigialization,
natural selection has ceased to work on it, and it is very unlikely to return