[Nathan Zachary]

It's nothing but a wild guess. Genetic changes are always recessive and results in a loss, never a gain, and never an improvement.

[orionblamblam]

> Genetic changes are always recessive and results in a loss, never a gain, and never an improvement.

Ah.... no.

[Ichneumon]

Genetic changes are always recessive

Wrong. See for example:

Genetic Variant Showing a Positive Interaction With ß-Blocking Agents With a Beneficial Influence on Lipoprotein Lipase Activity, HDL Cholesterol, and Triglyceride Levels in Coronary Artery Disease Patients

Six novel mutations of the LDL receptor gene in FH kindred of Sicilian and Paraguayan descent

Genetic restriction of HIV-1 infection and progression to AIDS by a deletion allele of the CKR5 structural gene

and results in a loss, never a gain,

Wrong again.

Genetic Variant Showing a Positive Interaction With ß-Blocking Agents With a Beneficial Influence on Lipoprotein Lipase Activity, HDL Cholesterol, and Triglyceride Levels in Coronary Artery Disease Patients

Evolution of new information

Spontaneous mutations in diploid Saccharomyces cerevisiae: more beneficial than expected

Are Mutations Harmful?

Evolution and Information: The Nylon Bug

Directed evolution of human estrogen receptor variants with significantly enhanced androgen specificity and affinity

Multiple duplications of yeast hexose transport genes in response to selection in a glucose-limited environment

Evolution of biological information

Evolution of biological complexity

and never an improvement.

And *this* is wrong as well. See for example:

Complete Rescue of Lipoprotein Lipase–Deficient Mice by Somatic Gene Transfer of the Naturally Occurring LPL^S447X Beneficial Mutation

Punctuated evolution caused by selection of rare beneficial mutations.

All mutations harmful?

PLEIOTROPIC EFFECTS OF BENEFICIAL MUTATIONS IN ESCHERICHIA COLI

The Distribution of Fitness Effects Among Beneficial Mutations

http://www.gate.net/~rwms/EvoHumBenMutations.html

Examples of Beneficial Mutations and Natural Selection

Hey, here's something that probably never occurred to you -- why don't you actually learn something about biology before you attempt to pontificate about it?