Are short spine doggos a good example of the kind of mutations

>>8536812

no because they die and who would want to mate with that.

File: sebabi.jpg (30KB, 489x313px) Image search: [Google]

30KB, 489x313px

>>8537327
this guy

>>8536812
No. Artificial selection is good for demonstrating that the mechanisms that allow evolution operates in exist, bit it's terrible for understanding evolution itself.

If you look at the gene pool of dogs, you'll find that the differences between breeds are just a handful of genes and that interbreeding between dogs is generally an extremely simple affair, excluding problems with drastic size differences and such.

A better model is the Darwin finches. Imagine there is an island with an average Finch on it, and two types of seeds, one that requires a large, hard beak to open it, and one that requires a small, dextrous beak, so that a mutation that's beneficial for eating one seed is harmful for eating the other. Initially, mutating in either direction is beneficial; if you are eating harder nuts than the rest of the finches at the expense of not eating smaller nuts a normal beak would give you that's a net gain--you have gained access to a resource with low competition in exchange for losing access to a resource with high competition, a net gain.

Fast forward a little and we now have a population of normal beaks, little beaks, and big beaks. The normal beaks must compete with small beaks, normal beaks, and big beaks for their food and are at a disadvantage. If you are a finch with a big beak and mate with a finch with a small beak, your kid will have a normal beak will be at a disadvantage because of it. Meanwhile small beak + small beak or big beak + big beak produces fitter children, and so the big beaked population is dominated by birds with primarily big beaked ancestors, and the small beaked population is dominated by birds with primarily small beaked ancestors. Eventually, random genetic drift happens between the two populations, and the mixing of the genes stops producing viable offspring, creating speciation.

tl;dr, when miscegenation breeds weakness, speciation results

>>8537327
Short spined wolves have been found in the wild

>>8537418
The picture in the op is not the result of breeding though.

File: short-spine-wolf.jpg (76KB, 500x698px)

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a wolf

>>8537418
I often ponder that when people use the darwinian finches as an example of mutation if they have any idea of the process of recombination.

it's not really a mutation if it's just a recombination of other genes.

>>8537796
There was one species of finch. Now there are 15. Are you claiming mutation did not happen?

What exactly are you trying to say?